Malicious PDF — malware analysis report

Static analysis result for SHA-256 0675050ba8cb3943…

MALICIOUS

PDF

63.4 KB Created: 2020-07-31 11:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c14f04971e455e0b237a8b3b3a6abefc SHA-1: 6bb5718f7efd47b8b87936f7d9dc2c413498275f SHA-256: 0675050ba8cb3943c24b51ec997b4ddc1f9208f123af15e56227bf4a2c56c67c
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure for a 'free download'. The presence of many Shopify-hosted PDF links, some marked as benign and others unknown, indicates a potential link farm strategy. The ML classifier strongly flagged this PDF as malicious.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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.cc/pify?keyword=free+download+arabya+rajani+bengali+pdf
    • http://files.bayshorepharmacy.com/uploads/1/3/0/8/130874566/dusidaxokebevogum.pdf
    • http://files.larkinswag.com/uploads/1/3/1/3/131379832/timezetowuwimuwufe.pdf
    • http://files.clquilters.org/uploads/1/3/1/4/131482991/lewumakaj.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5630/8123/files/tinuvedelirogipire.pdf
    • https://cdn.shopify.com/s/files/1/0438/7730/2427/files/23574919536.pdf
    • https://cdn.shopify.com/s/files/1/0434/3883/3831/files/wumajolana.pdf
    • https://cdn.shopify.com/s/files/1/0428/9232/9119/files/25026320293.pdf
    • https://cdn.shopify.com/s/files/1/0436/9688/1814/files/birilakaralixurasib.pdf
    • https://cdn.shopify.com/s/files/1/0433/8837/1107/files/57616736986.pdf
    • https://cdn.shopify.com/s/files/1/0432/7312/6052/files/mubamupelato.pdf
    • https://cdn.shopify.com/s/files/1/0431/1715/0368/files/98355180905.pdf
    • https://cdn.shopify.com/s/files/1/0435/5093/3155/files/32529064637.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tovovowegafakaroseras.pdf
    • https://cdn.shopify.com/s/files/1/0434/5567/6568/files/61747140383.pdf
    • https://cdn.shopify.com/s/files/1/0433/9118/9157/files/40655402039.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nanejixiv.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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000845d.bin
d673036c00565d08803835286c787249a42eccd8105a924cd54163eb5bf7a0bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x845D 5104 bytes
font_01_sfnt_off000095d4.bin
2330b959bdb5c970653e8091cfdf2af77fa91c81753a95d663f10e081bbd821f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95D4 13256 bytes
font_02_sfnt_off0000bd60.bin
522010fb87e42de2633365294513fcbd45dacbd9ce1900a5baa442a0513f3cbb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD60 15292 bytes

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