Malicious PDF — malware analysis report

Static analysis result for SHA-256 e44388cd5a903ac9…

MALICIOUS

PDF

41.4 KB Created: 2020-09-08 21:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43f71f76a79a0064d0deb636495791b1 SHA-1: aa2938b11476a418a4495eb6c695c4f810e0e1ef SHA-256: e44388cd5a903ac9d863629ddd8ec7a4c1ee5f795161a857509ff051150cd8e4
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a heuristic firing for a malicious redirector link, which is also present in the document body. The link leads to a URL that appears to be part of a scam, using a keyword related to a common technical issue. The document also contains a large number of embedded links, many of which point to Shopify domains, suggesting a link farm or SEO manipulation tactic. The primary malicious IOC is the redirector URL.

Heuristics 3

  • 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.
  • 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.link/wix?keyword=cannot+format+sd+card
    • https://cdn.shopify.com/s/files/1/0431/5345/7320/files/massive_mimo_beamforming_5g.pdf
    • https://cdn.shopify.com/s/files/1/0433/9207/3895/files/kunojofazolebasidegupefi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5955/2166/files/poloratigupibutaloja.pdf
    • https://cdn.shopify.com/s/files/1/0431/7492/0347/files/13260633585.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6152/files/metekikebaxumezi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2974/2246/files/kerijon.pdf
    • https://static.usrfiles.com/ugd/f35da0_d40de76172d2449d9b32ca7f33a7e0ab.pdf
    • https://static.usrfiles.com/ugd/d775a9_94275eb02713494ea1ae26859ee5d8ca.pdf
    • https://static.usrfiles.com/ugd/3bcfef_0c2f3fe65f2c46668daf55ed20f7a94a.pdf
    • https://cdn.shopify.com/s/files/1/0433/5386/6408/files/67002294792.pdf
    • https://cdn.shopify.com/s/files/1/0430/9958/6714/files/font_awesome_icons_css_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0432/4422/4679/files/2019_calendar_png_free.pdf
    • https://cdn.shopify.com/s/files/1/0428/7237/3411/files/36657442276.pdf
    • https://cdn.shopify.com/s/files/1/0427/7728/0671/files/42686453547.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000064e7.bin
6fcdd2ed72a589ca26850fd6987cfa8ead279072b3fab0f1f8d558b421cf3570		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E7 5040 bytes
font_01_sfnt_off000075f4.bin
f908ab1e6ac87606eeabbcc398f0e481abd9c342ce43827c58da3484d37a3a25		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75F4 10136 bytes

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