Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d76837d8d769ad1…

MALICIOUS

PDF

43.3 KB Created: 2020-08-22 20:06:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1efa21063ee5c89031dddf04f03df6bf SHA-1: 8d1c4cf091c9efb659ebbf98a37a695cc50853b9 SHA-256: 8d76837d8d769ad17b4080327f51a6fa1401b59a96bf6f23e5423dd59c02625d
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including one to a known malicious redirector, disguised as a weather report. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains the target URL and references to a weather report, reinforcing the lure. The presence of many external PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content.

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.ru/pify?keyword=weather+report+raleigh+north+carolina
    • http://vebodo.tarrantfatherhood.com/uploads/1/3/1/8/131856072/29a8aed1605b.pdf
    • http://files.barrymaguire.com/uploads/1/3/1/4/131414134/3532eacb695e9.pdf
    • http://files.stjohn23rdyouth.org/uploads/1/3/1/4/131483955/wemowetopezuru.pdf
    • http://zunon.newcanaanpizzaandtaqueria.com/uploads/1/3/1/3/131380771/xisusuwepetin-xososejawutelog-lekutovanimajin-bumivewo.pdf
    • http://files.gailbingham.com/uploads/1/3/1/4/131407572/a1cdb3af7e2.pdf
    • https://cdn.shopify.com/s/files/1/0433/7215/0947/files/51025459175.pdf
    • https://cdn.shopify.com/s/files/1/0435/8589/6609/files/rodazetusiniposim.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/95423568318.pdf
    • https://cdn.shopify.com/s/files/1/0429/1638/0831/files/zegixezejabozubogixo.pdf
    • https://cdn.shopify.com/s/files/1/0430/1163/7401/files/christmas_party_invitation_card_free.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/39720928980.pdf
    • https://cdn.shopify.com/s/files/1/0432/0316/6369/files/51804511687.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4889/files/cognitive_problem-_solving_skills_training.pdf
    • https://cdn.shopify.com/s/files/1/0428/9419/6902/files/91951035131.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57727452667.pdf
    • https://cdn.shopify.com/s/files/1/0429/9377/8837/files/mebovojaxugokixitagepajek.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/sotajixoj.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_off000069f5.bin
fbb653dc04ee9abb6373fe2b01c4d4c34e71e9ce965b6f1c5aba4916dd1b0bd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69F5 5028 bytes
font_01_sfnt_off00007b1d.bin
4ad7ce467872953ceb02683bf6b194eb2de874e7e7b47f585a29a1232453d8c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B1D 10832 bytes

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