Malicious PDF — malware analysis report

Static analysis result for SHA-256 63b58a788ecd2ce3…

MALICIOUS

PDF

39.1 KB Created: 2020-08-22 23:07:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8f6bf42719295aa57f67db9564b3767 SHA-1: 6fd0ccd2575824ec3e8e763742294472384ce3e4 SHA-256: 63b58a788ecd2ce3900e0ba3840b0ee4fa16b6cbcd6a3ad1fbeeecc9774e5786
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a high number of external links, with one identified as a malicious redirector. The document body, though obfuscated, contains a URL that appears to be a lure for a 'bses yamuna new connection form'. The ML classifier strongly flagged this PDF as malicious, indicating a sophisticated attempt to distribute malicious content or phish users. No scripts were extracted, but the presence of numerous links suggests a link farm or redirection strategy.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=bses+yamuna+new+connection+form
    • http://nidifud.escondidotreeservice.com/uploads/1/3/1/8/131856809/ea1a7849.pdf
    • http://savef.newdundeefireworks.com/uploads/1/3/0/7/130775818/2244229.pdf
    • http://peluwo.avienteconsulting.com/uploads/1/3/1/3/131380397/9796291.pdf
    • http://files.kerstinandlaw.com/uploads/1/3/0/7/130740524/5771672.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9160/8227/files/jivezip.pdf
    • https://cdn.shopify.com/s/files/1/0428/9848/9503/files/vba_set_number_format_decimal_places.pdf
    • https://cdn.shopify.com/s/files/1/0428/3020/0991/files/zafinun.pdf
    • https://cdn.shopify.com/s/files/1/0433/6739/9575/files/dnd_5e_wererat.pdf
    • https://cdn.shopify.com/s/files/1/0435/7157/6993/files/abhimanyudu_kadu_veedu_arjunudu_song.pdf
    • https://cdn.shopify.com/s/files/1/0432/2947/9076/files/zigarinikoxanodatowaz.pdf
    • https://cdn.shopify.com/s/files/1/0429/6055/2085/files/63047206870.pdf
    • https://cdn.shopify.com/s/files/1/0437/8125/9421/files/dowamiwojujuta.pdf
    • https://cdn.shopify.com/s/files/1/0436/0123/2035/files/child_and_adolescent_development_for_educators.pdf
    • https://cdn.shopify.com/s/files/1/0431/8032/7070/files/kazafinugizajajozi.pdf
    • https://cdn.shopify.com/s/files/1/0453/2230/5691/files/berusijosinadinuvisugisut.pdf
    • https://cdn.shopify.com/s/files/1/0462/7808/2720/files/volezuj.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c62.bin
24235decda6e8ff59089610ed3f551cb1a1d80d070f716e801ae16d443e8dfca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C62 5240 bytes
font_01_sfnt_off00006e2b.bin
fba091f23010125bf948c4413ab148bd30eabfe96adae66d74ce962785a47e0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E2B 9796 bytes

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