Malicious PDF — malware analysis report

Static analysis result for SHA-256 851ab2a8156c5198…

MALICIOUS

PDF

42.8 KB Created: 2020-08-17 08:59:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5dea154b689742d6d0c7aced53f472db SHA-1: e4a6a9bfd81f5ab9e526bf768c777ff614e6c791 SHA-256: 851ab2a8156c5198852f8d0296e7721cc6efa35d23b742e7dc60f556bed51037
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to '8th grade pre algebra worksheets pdf' and includes the malicious URL, suggesting a lure to trick users into clicking. The presence of a link farm heuristic further indicates an attempt to distribute 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/pify?keyword=8th+grade+pre+algebra+worksheets+pdf
    • http://files.cutfootsiouxresort.com/uploads/1/3/0/7/130740213/1617277.pdf
    • http://files.christiescollon.com/uploads/1/3/1/8/131872017/8822760.pdf
    • http://files.cambridgenc.org/uploads/1/3/0/7/130738951/pijuminetasotetiri.pdf
    • http://files.nickinaudephotography.com/uploads/1/3/0/8/130814855/wokezelitofijut.pdf
    • http://files.unionelks1583.org/uploads/1/3/0/7/130739222/koroxo-kikabowafomas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0432/3419/7666/files/jaraselogirado.pdf
    • https://cdn.shopify.com/s/files/1/0431/5280/1954/files/safaji.pdf
    • https://cdn.shopify.com/s/files/1/0429/4334/8892/files/xowekizewaxinabawikob.pdf
    • https://cdn.shopify.com/s/files/1/0435/7790/1219/files/17919785000.pdf
    • https://cdn.shopify.com/s/files/1/0433/5173/6471/files/online_virtual_ti-_84_graphing_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0440/4844/9701/files/cfe_exam_prep_course.pdf
    • https://cdn.shopify.com/s/files/1/0437/6618/6135/files/vabaniwobo.pdf
    • https://cdn.shopify.com/s/files/1/0438/2916/6242/files/reverse_linked_list_javascript.pdf
    • https://cdn.shopify.com/s/files/1/0438/7464/8232/files/historia_del_cemento_portland.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_off00005b9c.bin
557548970ad7758a76c5515330521aa54102cd91fec512a9aed1feeb8f96cc16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B9C 5332 bytes
font_01_sfnt_off00006ddd.bin
800a2647b450f485f6817347977266a8f60670f023aae6c0cbf6532f9460eb47		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DDD 10044 bytes
font_02_sfnt_off0000902f.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x902F 4324 bytes

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