Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c1dc765461b2956…

MALICIOUS

PDF

36.9 KB Created: 2020-08-12 22:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 55ab484640db43646ae27bfbe7f36d23 SHA-1: e54489209452df0eb00d2c1410c5fcdf158024b5 SHA-256: 4c1dc765461b295630b1f621940efc9dedfe0a53adf0256a54f3051455998c7c
120 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link redirects to `ttraff.ru`. This domain is flagged as a malicious redirector, likely serving as a lure for users searching for free programming books. The document body, though heavily obfuscated, contains text related to 'programming in ansi c free pdf download' and the `wkhtmltopdf` tool, reinforcing the lure.

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.ru/pify?keyword=programming+in+ansi+c+free+pdf+download
    • http://files.talltalerabbitry.com/uploads/1/3/0/7/130775978/e3435.pdf
    • http://denanedi.speed4yoursport.com/uploads/1/3/1/0/131070420/nekaja_tilun_sowuretonir.pdf
    • http://nonelimi.livinghopefwc.com/uploads/1/3/2/8/132814930/norodubevokojowa.pdf
    • https://cdn.shopify.com/s/files/1/0432/8508/6364/files/modajowugivasozuzu.pdf
    • https://cdn.shopify.com/s/files/1/0434/9050/8960/files/88110473260.pdf
    • https://cdn.shopify.com/s/files/1/0428/0451/0887/files/baxuvubezigekigig.pdf
    • https://cdn.shopify.com/s/files/1/0435/7505/0395/files/tuxitilonewegelogaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/6341/0845/files/66284645316.pdf
    • https://cdn.shopify.com/s/files/1/0441/4029/8392/files/1773395999.pdf
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/79149270180.pdf
    • https://cdn.shopify.com/s/files/1/0433/8070/3382/files/25861057477.pdf
    • https://cdn.shopify.com/s/files/1/0435/8796/0989/files/least_squares_solution_calculator.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/14721186133.pdf
    • https://cdn.shopify.com/s/files/1/0428/9619/5737/files/medical_fitness_certificate_for_engineering_admission.pdf
    • https://cdn.shopify.com/s/files/1/0431/4575/6821/files/8224015138.pdf
    • https://cdn.shopify.com/s/files/1/0428/1086/7871/files/livatag.pdf
    • https://cdn.shopify.com/s/files/1/0434/5253/0845/files/9675131086.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000046fc.bin
b80419be36db15b77526bdbe12d9926a09e3416c075611af6a3e26105fce9ddd
pdf-font-stream PDF embedded font (sfnt) at offset 0x46FC 5276 bytes
font_01_sfnt_off000058d5.bin
8ab56906cc2a3c5216269ab2642b6356f8aad3bef28c2b37e14e0546f373bec3
pdf-font-stream PDF embedded font (sfnt) at offset 0x58D5 9276 bytes
font_02_sfnt_off00007884.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7884 4324 bytes