Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0d9334da4c04a5c…

MALICIOUS

PDF

40.8 KB Created: 2020-08-12 12:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0fa5b6427ad8d717506a3ec648dd3270 SHA-1: fc68fc4e8e2697b5984e6ab46b4af2354019b3a6 SHA-256: c0d9334da4c04a5c7d263a6a4cd72f3c8c0f2344df070be72c255904be743981
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, including a critical redirector link to ttraff.cc, suggesting a lure for users seeking free technical documents. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the primary malicious URL and a list of other Shopify-hosted PDF links, likely part of a link farm to improve search engine ranking for 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.cc/wb?keyword=engineering%20thermodynamics%20pk%20nag%20pdf%20free%20download
    • http://files.immaculataschool.org/uploads/1/3/0/8/130813988/76ab218c2.pdf
    • http://files.gotechsfl.com/uploads/1/3/1/4/131453302/taxevozuwokibap-miwuxowajoda-fetuba-mabuve.pdf
    • http://files.cunctor.com/uploads/1/3/1/3/131380773/tudejuguvedaxem_basasobeb_fotefejeporifi_nelefogu.pdf
    • http://files.jachristensen-maker.com/uploads/1/3/1/4/131408204/8420523.pdf
    • http://jeromi.elenasuglia.com/uploads/1/3/1/6/131606490/5b24efd0be.pdf
    • https://cdn.shopify.com/s/files/1/0432/3124/8542/files/37404228039.pdf
    • https://cdn.shopify.com/s/files/1/0431/7157/8024/files/27405074490.pdf
    • https://cdn.shopify.com/s/files/1/0432/8580/7268/files/63003010924.pdf
    • https://cdn.shopify.com/s/files/1/0433/7470/6853/files/puvobefimomutonegulofo.pdf
    • https://cdn.shopify.com/s/files/1/0429/7634/6266/files/sevolusefixa.pdf
    • https://cdn.shopify.com/s/files/1/0429/9853/0201/files/anganwadi_up_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/4691/9579/files/bases_de_datos_en_excel.pdf
    • https://cdn.shopify.com/s/files/1/0427/8750/4294/files/vajifivukuj.pdf
    • https://cdn.shopify.com/s/files/1/0430/7252/0353/files/79532286970.pdf
    • https://cdn.shopify.com/s/files/1/0431/4949/2384/files/routledge_handbook_of_ecological_economics_nature_and_society.pdf
    • https://cdn.shopify.com/s/files/1/0430/7091/4717/files/70845830436.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005536.bin
02d82992ccafd299538005d9bd74917d5ee6d45f01c8f2c56f41ed3c5963b27c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5536 5784 bytes
font_01_sfnt_off000068cb.bin
33d80b5e357abfa3ea91f5eff18928953f8e36d8e9a7aea158c838e8ae756dd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68CB 2116 bytes
font_02_sfnt_off00007295.bin
9a4b551b66edd032cdff31c72b61b86c1daa88cd8548d1fb3c2ead99ad74a3bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7295 10204 bytes

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