Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d87af48c608ac33…

MALICIOUS

PDF

41.4 KB Created: 2020-08-22 18:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 69269c86cbe97b67d220e4fdee08652e SHA-1: 51324bd6fe66211eeaacccf6fddcf4b209adb203 SHA-256: 5d87af48c608ac33caa0d5d56f9176ec54a8bc2d5c2cd8a628bba9804474ddc9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which point to Shopify domains hosting PDF files, suggesting a link farm or SEO manipulation tactic. One URL, 'https://ttraff.cc/pify?keyword=english+brain+teasers+worksheets+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to the redirector URL and other Shopify links, reinforcing the lure.

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=english+brain+teasers+worksheets+pdf
    • http://files.projecthumanenepal.org/uploads/1/3/1/4/131412181/xavojomog.pdf
    • http://puwog.blackarrowconferences.com/uploads/1/3/1/4/131453329/6e00b9cc025cb3.pdf
    • http://revudaxev.georgeflcharlesairport.com/uploads/1/3/0/7/130775136/388e9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0441/3066/4600/files/2012_dodge_charger_pursuit_manual.pdf
    • https://cdn.shopify.com/s/files/1/0464/9261/4824/files/19809374253.pdf
    • https://cdn.shopify.com/s/files/1/0432/0293/6992/files/855-_319-_4450.pdf
    • https://cdn.shopify.com/s/files/1/0432/1440/5793/files/vapepufesago.pdf
    • https://cdn.shopify.com/s/files/1/0431/2930/7287/files/gajofiz.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2122/files/fevefadixatinupekiruk.pdf
    • https://cdn.shopify.com/s/files/1/0433/1080/9256/files/91872859163.pdf
    • https://cdn.shopify.com/s/files/1/0461/6585/2312/files/82215922096.pdf
    • https://cdn.shopify.com/s/files/1/0434/8051/4713/files/catholic_confirmation_invitation_template.pdf
    • https://cdn.shopify.com/s/files/1/0436/9838/9145/files/christophany_answers_in_genesis.pdf
    • https://cdn.shopify.com/s/files/1/0440/6607/8870/files/4657846980.pdf
    • https://cdn.shopify.com/s/files/1/0461/8236/7386/files/71468870236.pdf
    • https://cdn.shopify.com/s/files/1/0437/9358/0189/files/nejadisivunaxavujodisifu.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_off0000615b.bin
d324ca8924db30e980dbc1a7da30d0768c8fb1bdba6a24e2fc95715e9d2fea95		 pdf-font-stream PDF embedded font (sfnt) at offset 0x615B 5556 bytes
font_01_sfnt_off00007445.bin
8da79698b7025451ecfc5315fbbf313c8297dbb9c0e498163148b7c8fbaec3e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7445 10776 bytes

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