Malicious PDF — malware analysis report

Static analysis result for SHA-256 729f9a916ade0edf…

MALICIOUS

PDF

36.0 KB Created: 2020-10-03 13:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 6a5f74ec6fb9b36024225fb961725990 SHA-1: f28d306b28ff478b28e30c055e592e868bc82594 SHA-256: 729f9a916ade0edfc87adec7943223829a03d55c7fa343a469ed0d86338f33dd
214 Risk Score

Malware Insights

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

The PDF document contains a callback phishing lure, instructing the user to call a phone number related to billing or fraud. It also contains numerous links to external PDFs, with one link pointing to a known malicious redirector infrastructure. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs suggests an attempt to redirect the user to malicious content.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://cctraff.ru/strik?keyword=telefono+fremap+malaga+calle+hamlet In PDF document text
    • http://files.hopejns.com/uploads/1/3/0/8/130874063/deravavoj.pdfIn PDF document text
    • http://megulolam.reclaimingbiblicalchristianity.com/uploads/1/3/0/7/130739353/eecf61fc89643.pdfIn PDF document text
    • http://files.originalgravitytours.com/uploads/1/3/1/6/131606109/f433d8c153.pdfIn PDF document text
    • http://dapefa.utahstudentnurse.org/uploads/1/3/1/4/131438304/vezoziwofu-nobizobenofusu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4956/5853/files/bubble_trouble_unblocked_games.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2965/8790/files/the_science_of_getting_rich_in_hindi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0084/7781/files/jefferson_elementary_school_belleville_il.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53af94df-92b1-4906-b6e9-87df86d5f4b0/xuvivuduzexivodove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa0c9d97-0bcb-47e2-84bc-30f32ba692bb/91202392765.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf66c876-62d3-4b1a-9126-1248c0d886f3/risadazi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc694ae9-dfa2-41e9-8e30-5e491bb8782f/98351398492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c08e43c-9b57-43b3-a947-8ba411801f2b/29346885161.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b10e3985-e9c7-4170-9366-6a642400577e/pasezerafuropatafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52c0ebdc-2715-4128-9c5c-3ce20786900c/53993012886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b26a349-4966-4772-82fc-f087fd7db582/giwitopaja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4ae3389-8c6e-454e-8610-cc6e505f15a6/61577803014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06eebb05-ddc0-433b-9c94-3bb2afb9771d/pimejuwabowurugugaxuxof.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004fb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FB2 5200 bytes
SHA-256: 5b991ca35295255d2494ff256de7f921eef9275bad0c24e9c48b4ef09076b0f8
font_01_sfnt_off00006139.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6139 10184 bytes
SHA-256: d27cdf0779c5abbc00b12763bc22bb5366df9052a3f2f4c7a7b90b1b88913ce6

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