Malicious PDF — malware analysis report

Static analysis result for SHA-256 77b318bce1cced3a…

MALICIOUS

PDF

64.9 KB Created: 2020-07-31 16:46:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d5c604894679f8e9314acd61f3fe5ad8 SHA-1: b8615507b95a40cb4a70cb9b40712abf20fbcd37 SHA-256: 77b318bce1cced3ac3a5abfeda96725165aa087b43f760cedd9480f09afa79df
174 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a redirector to malicious infrastructure. The 'SE_CALLBACK_LURE' heuristic suggests a phishing or scam pretext. While no scripts were explicitly extracted, the presence of numerous external links, including one pointing to a known redirector, indicates an attempt to lead the user to a malicious site.

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.
  • 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://ttraff.ru/pify?keyword=rockland+journal+news+police+blotter
    • http://files.whatwouldateacherdo.com/uploads/1/3/1/4/131454238/3e653d2cf4.pdf
    • http://files.mediocreatbest.net/uploads/1/3/0/7/130739316/limokegev.pdf
    • http://files.ravenshuskyhavenandrescue.org/uploads/1/3/1/3/131398059/4085973.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jidaxuno.pdf
    • https://cdn.shopify.com/s/files/1/0433/1238/2116/files/fojobekeligorivuvawagesaj.pdf
    • https://cdn.shopify.com/s/files/1/0433/5792/9621/files/59498242127.pdf
    • https://cdn.shopify.com/s/files/1/0430/8028/6372/files/furagesefibajewaned.pdf
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/46872199974.pdf
    • https://cdn.shopify.com/s/files/1/0430/0403/5221/files/12186816050.pdf
    • https://cdn.shopify.com/s/files/1/0432/3006/8894/files/98313948720.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/5561128363.pdf
    • https://cdn.shopify.com/s/files/1/0436/9186/8313/files/regejuponunigoti.pdf
    • https://cdn.shopify.com/s/files/1/0431/8163/7794/files/kosudofelar.pdf
    • https://cdn.shopify.com/s/files/1/0439/1721/3851/files/sirawizejibarabazerixogi.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c14a.bin
de33ce238c0e3103b22ba62da6ae44873f33a236a8a6fe5164b62b135fd9fd3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC14A 5444 bytes
font_01_sfnt_off0000d3f3.bin
bdf9a359d3d6d561cb99df41cbe8c3d8bf71d67f8304f1cabd26de3213f52d60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F3 10140 bytes

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