Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c744efa8d878ea4…

MALICIOUS

PDF

41.8 KB Created: 2020-08-12 00:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc2d91547a4fb4c85e90fa4f256f5570 SHA-1: e632e5097c0015969cf0888aeb50b3290d1f7d7f SHA-256: 1c744efa8d878ea4fd437cf866287b8798b89328ae53ce979a0f15d55b2c0a66
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to a known malicious redirector, and another indicated a large link farm, suggesting the primary purpose is to direct users to malicious sites. The document body itself is largely unreadable binary data, but it does contain the URL that points to the redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=asma+tratamento+pdf
    • http://files.gamescapesf.store/uploads/1/3/1/4/131482832/movusuxa.pdf
    • http://muzosanor.phoenixlegacyofcompassion.org/uploads/1/3/1/4/131437657/ab131.pdf
    • http://wakaminoj.authorstephaniesummers.com/uploads/1/3/1/4/131482995/6392295.pdf
    • http://likat.fuelyourvibe.com/uploads/1/3/0/7/130738970/7799450.pdf
    • http://files.ijart.info/uploads/1/3/1/4/131437753/61207f.pdf
    • https://cdn.shopify.com/s/files/1/0436/6080/4249/files/54883900011.pdf
    • https://cdn.shopify.com/s/files/1/0431/4585/5137/files/15501165426.pdf
    • https://cdn.shopify.com/s/files/1/0430/9309/8660/files/administrative_management_theory_by_henri_fayol.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1542/files/ti_84_plus_ce_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/8909/1998/files/vebibe.pdf
    • https://cdn.shopify.com/s/files/1/0433/1310/2998/files/deluninaxa.pdf
    • https://cdn.shopify.com/s/files/1/0437/4783/6065/files/tijalevozogukituj.pdf
    • https://cdn.shopify.com/s/files/1/0435/2986/3320/files/lapokadurutobi.pdf
    • https://cdn.shopify.com/s/files/1/0437/3970/9605/files/biblia_catolica_en_ingles.pdf
    • https://cdn.shopify.com/s/files/1/0432/8911/6840/files/91121395564.pdf
    • https://cdn.shopify.com/s/files/1/0430/9119/8112/files/73706070757.pdf
    • https://cdn.shopify.com/s/files/1/0432/7643/5612/files/best_highlighter_app_android.pdf
    • https://cdn.shopify.com/s/files/1/0433/0638/5558/files/81495180464.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006566.bin
88ba7797689ca897973d4b267a1556d871bb3b2b9ee6c2dc5a00e322863eabab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6566 5144 bytes
font_01_sfnt_off000076c0.bin
5dbef26a5beeabf19573bac1baa7b0cf4cca4331ab7f8a331fc295cb2b7c741d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76C0 10700 bytes

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