Malicious PDF — malware analysis report

Static analysis result for SHA-256 331a9dbb1a15ae37…

MALICIOUS

PDF

82.7 KB Created: 2020-07-09 20:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-24
MD5: 68f1026b350b828a62e74010b7f5aecb SHA-1: 32bb85fe4bd7e2bb03acc3a03404b97c8d9a3f8f SHA-256: 331a9dbb1a15ae37b2516c73c8bddd32d12c4d8fefb272faab53f41ec377cf21
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded links, many of which point to redirector domains or link farms. The primary heuristic indicates that the document links to known malicious redirector infrastructure. The document body text, though partially obfuscated, contains a URL that is also present in the heuristics and IOCs, suggesting a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/wb?keyword=database%20systems%20design%20implementation%20and%20management%20coronel%20pdf In PDF document text
    • http://files.sanblastoursislands.com/uploads/1/3/2/6/132695195/fimegupum.pdfIn PDF document text
    • http://files.originalsexyslave.com/uploads/1/3/0/9/130969004/ca2abe.pdfIn PDF document text
    • http://files.kansasactioncoalition.com/uploads/1/3/0/7/130738806/nisezoroki.pdfIn PDF document text
    • http://files.co-opurbana.com/uploads/1/3/1/3/131383553/50e504ba.pdfIn PDF document text
    • http://files.justpoogie.net/uploads/1/3/0/7/130776558/petanadu.pdfIn PDF document text
    • http://files.raglandclay.com/uploads/1/3/1/3/131383588/darovimenon_sokaretulozi.pdfIn PDF document text
    • http://files.jenniferbelphotography.com/uploads/1/3/1/4/131483185/4f650169b2d9.pdfIn PDF document text
    • http://files.haggartbelting.com/uploads/1/3/2/6/132696109/lixusojow_loxojobanox_dazetafamijuw_sezufufat.pdfIn PDF document text
    • http://files.texashollandlops.com/uploads/1/3/1/3/131379371/7953459.pdfIn PDF document text
    • http://files.historyunderground.us/uploads/1/3/1/3/131398000/bedufujarum.pdfIn PDF document text
    • http://files.woodyshticks.com/uploads/1/3/1/3/131379612/ritozo_luwubuvilul_bizifodoli.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://zalisit.files.wordpress.com/2020/06/45208799547.pdfIn PDF document text
    • https://jibawukaj.files.wordpress.com/2020/07/wanaweronutegifi.pdfIn PDF document text
    • https://kugigoke149047822.files.wordpress.com/2020/07/vezovonuganadalok.pdfIn PDF document text
    • https://bitepon.files.wordpress.com/2020/06/23906904467.pdfIn PDF document text
    • https://tazudumo.files.wordpress.com/2020/07/losimogebidigi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/zipepatijexozuzazes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gojifazuxosupimuron.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rinajimakonewob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/74535711799.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/potiwabuvufepatene.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/95181885481.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/livoxigugefeguvon.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC43 5504 bytes
SHA-256: 08973f788880272b7223669799d6b91c906cf0471ccfe09f4e7541220ed9175b
font_01_sfnt_off00010eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDA 15064 bytes
SHA-256: 437012ae86106b8ec9933f30331eed5e5f7491ad6ca2e842b40d13be76594ab7