Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a6252c1201f299…

MALICIOUS

PDF

45.6 KB Created: 2020-08-12 17:36:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8213d3f4e8a8eb211ed1a802a1722244 SHA-1: 38893045234c3fbef4bf1d82419a6fb40356674b SHA-256: 78a6252c1201f299699a3c0aa9b48022666e3a6a132ee917b6a56dbdaf6a5704
162 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though obfuscated, contains text suggesting a lure for a job application cover letter, which is then followed by the malicious URL. This indicates an attempt to trick the user into visiting a malicious site, likely to download further malware or phish for credentials.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=cover+letter+sample+for+job+application+pdf
    • http://files.mjsfireandsecurity.co.uk/uploads/1/3/1/4/131437702/bda4abd8f6823b.pdf
    • http://files.spectacularvintageevents.com/uploads/1/3/0/7/130775398/zuretokukedexupupa.pdf
    • http://files.madameallen.org/uploads/1/3/0/8/130813710/xafekev.pdf
    • http://kogofetu.oraclefinancialgroup.com/uploads/1/3/0/7/130774965/pudavotebadegodukola.pdf
    • http://wifenezev.abcskatingacademy.com/uploads/1/3/0/7/130739777/4512972.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23342697578.pdf
    • https://cdn.shopify.com/s/files/1/0428/1637/2892/files/zikoxobide.pdf
    • https://cdn.shopify.com/s/files/1/0436/5703/5929/files/godesezegovoder.pdf
    • https://cdn.shopify.com/s/files/1/0431/7315/0869/files/license_express_washington.pdf
    • https://cdn.shopify.com/s/files/1/0432/9262/2998/files/72365346117.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/fuwosebewiwakusegevitu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6112/5015/files/22136170002.pdf
    • https://cdn.shopify.com/s/files/1/0433/9482/6396/files/velaxowa.pdf
    • https://cdn.shopify.com/s/files/1/0429/0550/1852/files/27448116834.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3680/files/45577696317.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_off00006f28.bin
69243d0101a7e49bef4f09a018ce31c819da1b0067133392d5c12a6108d39b3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F28 5480 bytes
font_01_sfnt_off000081b8.bin
599bc4f11803fc58f9fd7da438c47578b4d160bb6e19c070c9d17c1c18ef0863		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81B8 11076 bytes

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