Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e7ad32dc474dd46…

MALICIOUS

PDF

66.7 KB Created: 2020-08-05 17:47:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86a1e043cedffdedeb920a9fa907bb81 SHA-1: 06d0a77e57c58d198428871a91e3f0b50d55225b SHA-256: 6e7ad32dc474dd46431196fa2b0e415a3e2f9b23d467999b3372c097ec6f855a
202 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including links to known redirectors and a large farm of generated SEO PDF links. The document body contains a visible call-to-action phrase and a URL that redirects to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.com/pify?keyword=sri+rudram+pdf+english
    • http://files.nejnamc.org/uploads/1/3/1/6/131607346/bujowadatasivo.pdf
    • http://files.jellybeanschilddevelopmentcenter.com/uploads/1/3/1/3/131383604/fifefaparo_lorasewanizagal.pdf
    • http://files.rememberingresistance.com/uploads/1/3/1/0/131070518/2184277.pdf
    • http://files.handymanportlandmaine.com/uploads/1/3/0/8/130814390/sefutuligufaku.pdf
    • http://files.sueannecelebrant.com/uploads/1/3/1/4/131437351/26ff42c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rixaraxamixenapo.pdf
    • https://cdn.shopify.com/s/files/1/0438/1153/7053/files/71067917979.pdf
    • https://cdn.shopify.com/s/files/1/0428/9763/7535/files/60934946900.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/danedogorolulefumatexa.pdf
    • https://cdn.shopify.com/s/files/1/0434/6878/3766/files/48719157924.pdf
    • https://cdn.shopify.com/s/files/1/0427/8213/0332/files/75065015516.pdf
    • https://cdn.shopify.com/s/files/1/0433/7877/0078/files/wepixoxebufekemali.pdf
    • https://cdn.shopify.com/s/files/1/0435/5905/9615/files/10957016944.pdf
    • https://cdn.shopify.com/s/files/1/0440/0077/2254/files/74765154181.pdf
    • https://cdn.shopify.com/s/files/1/0432/9105/0137/files/5095519770.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_off0000bd2c.bin
7ce21f796d76b0684ab3ae7f102b09237b72ae3148efee41833f6fe79c83c3f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2C 5560 bytes
font_01_sfnt_off0000cfe8.bin
edb7626f6b71500be3c786c2868d47f3d2698ee8795fa758e8ab0513af35c4a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE8 14808 bytes

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