Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef443e1ad82d53ad…

MALICIOUS

PDF

44.3 KB Created: 2020-07-25 12:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-04
MD5: 905852a045858419d88c616c92de3f1c SHA-1: 07b240bd4dae8106c4dc5978aca6661706ede9ec SHA-256: ef443e1ad82d53ad43a1df8b5647cb2d7c997cee128501eaa7c7733dce58546a
194 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to the presence of a large number of external links, indicative of a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://ttraff.com/wb?keyword=pdf%20blockchain%20explained', is flagged as a known malicious redirector. The document body is heavily obfuscated and appears to be generated content, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.com/wb?keyword=pdf%20blockchain%20explained In PDF document text
    • http://files.horizonmusicedson.com/uploads/1/3/0/7/130775596/3be619dd.pdfIn PDF document text
    • http://files.199boxingwrestling.com/uploads/1/3/1/0/131070469/5025650.pdfIn PDF document text
    • http://files.antoinettecarrier.com/uploads/1/3/1/1/131164027/mazemogenifajilog.pdfIn PDF document text
    • http://files.umcofmacedonia.org/uploads/1/3/1/4/131437017/jawibikarivamu-vixel.pdfIn PDF document text
    • http://files.maxsseafoodcafe.com/uploads/1/3/1/1/131163740/8536cc268186b8d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/15138334831.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3917/8399/files/37742645691.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0485/4426/files/83247001467.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89120948070.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/66074280558.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8059/7152/files/38885316618.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2133/5702/files/rubudurunarozutomegusewu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vepotarinaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/2606/2239/files/209868117.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5943/6951/files/71597916807.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5162/2306/files/fizopisuretolabo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8189/9944/files/12132129811.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5542/3383/files/tuvir.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FDA 4948 bytes
SHA-256: 2a66fb68a10c01b28c8be5e8d31d3b1a3ec89ae61b4ca472aac60c913317e3ee
font_01_sfnt_off00008099.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8099 10388 bytes
SHA-256: a7c1c06018b998b3c9ece8283645a5a38b82cfd57853a070f4d6c1d1d692d29a

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