Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c83d0011b22b566…

MALICIOUS

PDF

45.5 KB Created: 2020-08-07 06:28:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6404e11d6cdba6f999e5a436ace74d9d SHA-1: cb08578c38410e015bd8f82cb5ff9a382c2453cf SHA-256: 0c83d0011b22b566bc36df815dfb1516e66d8fcf4af561895a8b7f0b434c0906
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised with text suggesting a legitimate download. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this malicious intent. Additionally, the PDF hosts a large number of external links, many pointing to Shopify, which is characteristic of SEO link farms used to distribute malicious content. No scripts were extracted, but the presence of embedded URLs and the ML classifier strongly indicate malicious intent.

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/pify?keyword=retire+early+with+real+estate+pdf+download
    • http://files.dead-finder.com/uploads/1/3/0/8/130813141/b53d55292.pdf
    • http://files.hanmaumchurchdfw.com/uploads/1/3/0/7/130775368/1580979.pdf
    • http://files.13thdistrictofohio.org/uploads/1/3/2/6/132682040/pugikutopufamidameba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4065/2960/files/59005346311.pdf
    • https://cdn.shopify.com/s/files/1/0428/8443/2038/files/bread_making_ingredients.pdf
    • https://cdn.shopify.com/s/files/1/0438/9486/6088/files/jukosawuleguguvemeduxusi.pdf
    • https://cdn.shopify.com/s/files/1/0439/1570/6523/files/electronics_and_telecommunication_engineering_interview_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/3337/9487/files/82425339284.pdf
    • https://cdn.shopify.com/s/files/1/0437/4999/8743/files/rexigoxabupomekodutivo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2499/0887/files/98075763965.pdf
    • https://cdn.shopify.com/s/files/1/0436/2534/9283/files/vapisir.pdf
    • https://cdn.shopify.com/s/files/1/0437/6566/1853/files/directv_com_rebate.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0120/files/asme_b_pv_code_section_ix.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_off00006b1b.bin
3f9b3192343f13b5d748708837e4c6ecd21dada8b5eab888d49f161d9cc9173c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B1B 5332 bytes
font_01_sfnt_off00007d4a.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D4A 1800 bytes
font_02_sfnt_off000085d8.bin
1889f5d2ecbfe48698f73c8b27ec5413282b9693b240f95575776d6891a88c38		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85D8 10152 bytes

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