Malicious PDF — malware analysis report

Static analysis result for SHA-256 080c60007031c7e2…

MALICIOUS

PDF

44.7 KB Created: 2020-08-21 22:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0c9c5c55ebbe4af8d2900a9cb87e0d14 SHA-1: 23014f5dae38c2b091e868395e8a40da99501047 SHA-256: 080c60007031c7e26a6ce588b40c18ee6b33703066c4e4f3884d0cdfb304f121
194 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to what appears to be SEO link farm content, and one critical link to a known malicious redirector. The document body also contains a lure suggesting the user needs to install a browser extension or update to view content, which is a common social-engineering tactic. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to malicious sites.

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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=free++chrome+windows+7+32bit
    • http://files.iowabluechickenclub.com/uploads/1/3/2/3/132303320/nuribowugavebojijeve.pdf
    • http://files.helptakeaction.com/uploads/1/3/2/6/132681938/3009213.pdf
    • http://files.bcindivisible.org/uploads/1/3/1/4/131411147/2fbecba8e9f.pdf
    • http://files.garlandcountyvote.org/uploads/1/3/1/4/131407668/e086707d48.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/8113/7316/files/convert_excel_to_google_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0434/4473/2065/files/39635400848.pdf
    • https://cdn.shopify.com/s/files/1/0428/6647/5174/files/vediz.pdf
    • https://cdn.shopify.com/s/files/1/0431/4103/8229/files/pumajexewozesuji.pdf
    • https://cdn.shopify.com/s/files/1/0437/1451/1001/files/disk_utility_can_t_repair_this_disk.pdf
    • https://cdn.shopify.com/s/files/1/0438/3742/3776/files/47648758489.pdf
    • https://cdn.shopify.com/s/files/1/0438/3434/3574/files/balada_para_adelina_piano_partitura_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0437/1188/9562/files/bugazarawab.pdf
    • https://cdn.shopify.com/s/files/1/0429/5720/9753/files/ffxiv_blacksmith_leveling_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1924/files/97516274754.pdf
    • https://cdn.shopify.com/s/files/1/0432/0870/4164/files/category_theory_for_programmers_bartosz_milewski.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000637c.bin
4d0260465e4739898fbe060e41be6aa46dece15368c21fb42fedfbea020607a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x637C 5288 bytes
font_01_sfnt_off0000755f.bin
a1ef9bed2282617ef340b1061e7846b9c530887abe6dd30af845bc245dc82158		 pdf-font-stream PDF embedded font (sfnt) at offset 0x755F 10036 bytes
font_02_sfnt_off000097ab.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97AB 4324 bytes

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