Malicious PDF — malware analysis report

Static analysis result for SHA-256 d10daf5cd3c77a82…

MALICIOUS

PDF

45.5 KB Created: 2020-08-21 12:24:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d89f54298ad8f102e32e91911f0e0893 SHA-1: 018ce9c1bf44d9794fc605bdb77910e1756b2eed SHA-256: d10daf5cd3c77a82ddb62dddc34553238beafd509919c1aa44e60bc94a27c56a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=metformin+maximum+dose+in+pregnancy'. Another heuristic identified a large number of external PDF links, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL and a Shopify URL, reinforcing the malicious intent.

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.com/pify?keyword=metformin+maximum+dose+in+pregnancy
    • http://files.juliaalbain.com/uploads/1/3/2/6/132681513/4048436.pdf
    • http://vimir.hertzogfamilyeyecare.com/uploads/1/3/0/8/130814855/855131.pdf
    • http://xesiwu.dollargeneralpennylist.com/uploads/1/3/1/4/131406352/jejale_reputibub_narisikexafovin.pdf
    • http://files.nelsonrealm.com/uploads/1/3/1/6/131606087/2088962.pdf
    • http://files.midlandcountydashboard.org/uploads/1/3/1/4/131408741/narabumuponebe_tamelo_gonowe_xatifit.pdf
    • https://cdn.shopify.com/s/files/1/0432/5425/1670/files/38474984539.pdf
    • https://cdn.shopify.com/s/files/1/0429/8709/4179/files/mabanugixi.pdf
    • https://cdn.shopify.com/s/files/1/0452/4238/4545/files/issuu_download_online.pdf
    • https://cdn.shopify.com/s/files/1/0430/1206/3391/files/juxubuvamaserafoso.pdf
    • https://cdn.shopify.com/s/files/1/0432/7122/5502/files/93020272123.pdf
    • https://cdn.shopify.com/s/files/1/0431/5453/8656/files/adobe_photoshop_free_softonic.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/gobivaviseboredere.pdf
    • https://cdn.shopify.com/s/files/1/0436/4910/6073/files/95403712056.pdf
    • https://cdn.shopify.com/s/files/1/0432/0532/9064/files/wuxutun.pdf
    • https://cdn.shopify.com/s/files/1/0430/5341/6601/files/beatles_string_quartet_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0433/7015/2088/files/86967698862.pdf
    • https://cdn.shopify.com/s/files/1/0432/8023/6702/files/loruxediwesuvi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4890/2557/files/panchatantra_stories_in_kannada_free_download.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_off0000722b.bin
b4ac28cf9e08a72ac953687065c252b455b108fbe7265c4b1542372c7659b2eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x722B 5616 bytes
font_01_sfnt_off00008547.bin
5cb49f26dc59cf5670e0f4b6d9d48d70b010d80b20f067a378e78572ae55214e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8547 10320 bytes

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