Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a93ba789a35cb7b…

MALICIOUS

PDF

40.8 KB Created: 2020-08-30 13:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4941e246141d0251cc92f5cdb835866 SHA-1: 9eea4c214df6c609259e6828a4acf6afd3431b6f SHA-256: 6a93ba789a35cb7b80413576cc6f769472b397a1cc6882a63a731e5e20d400bd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain the URL 'https://ttraff.com/wix?keyword=solve+proportion+worksheet', suggesting a lure to a malicious site. The presence of a large number of external PDF links, many pointing to Shopify, indicates a potential link farm or SEO manipulation tactic 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.com/wix?keyword=solve+proportion+worksheet
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7900/7384/files/gamades.pdf
    • https://cdn.shopify.com/s/files/1/0450/3139/1396/files/atresia_duodenal_congenita.pdf
    • https://cdn.shopify.com/s/files/1/0432/2479/3245/files/car_wash_business_plan_philippines.pdf
    • https://cdn.shopify.com/s/files/1/0435/2249/0528/files/santoral_catolico_2020.pdf
    • https://cdn.shopify.com/s/files/1/0431/5663/5816/files/22094642129.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a1294d9ed1a4a2b9e138cccafa0e55e.pdf
    • https://static.usrfiles.com/ugd/b8c837_50d717412911452c9e850a5bb5fc6dc9.pdf
    • https://static.usrfiles.com/ugd/c7ef1a_de755a7b4e6e49b29826ade85c126bfc.pdf
    • https://static.usrfiles.com/ugd/e3ff21_97fac7fe3b9c4f698a4d8ea6745238af.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7a857dc0c504b479524203800e8996a.pdf
    • https://static.usrfiles.com/ugd/d3758e_361a73ed878b4fc6b878782989d3a52b.pdf
    • https://static.usrfiles.com/ugd/7f46b5_34076d7a67054e31acaf17a2ce4edd89.pdf
    • https://static.usrfiles.com/ugd/b8c837_38d88a5e05be4ae1b94398722fe55f31.pdf
    • https://static.usrfiles.com/ugd/856cea_1df2a1b8a7414b209183a51489e94128.pdf
    • https://static.usrfiles.com/ugd/b8c837_2df26a97b4c64eae930d8ae76ac9163c.pdf
    • https://cdn.shopify.com/s/files/1/0437/5783/0298/files/bangla_film_gana.pdf
    • https://cdn.shopify.com/s/files/1/0434/0767/1453/files/wipomikoturirun.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_off0000620f.bin
8ff035260be12ae83551f5a0919446f1411146547d52a8b0b5b75d91a7b92ed0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x620F 5016 bytes
font_01_sfnt_off00007333.bin
c9d17e47188abc2cded922c48d13c04fb5dab0e40b94e8cf1e807646682c488b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7333 10360 bytes

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