Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c547be2d86d4289…

MALICIOUS

PDF

42.0 KB Created: 2020-08-10 10:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7eacbf964c9202b2787188677ef59d14 SHA-1: c6baf0be6f2761569d7be34ae6ec418018178006 SHA-256: 3c547be2d86d42893b1aa30bf888cd3e6c568e4e1c537bed510b1cec56623508
120 Risk Score

Malware Insights

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

The PDF document is identified as malicious due to its inclusion of a link farm, which is a common technique for SEO poisoning and redirecting users to malicious sites. The primary malicious URL identified is https://ttraff.ru/pify?keyword=cover+letter+for+sales+job+pdf, which is flagged as a known malicious redirector. The document body, though heavily obfuscated, contains text related to a 'cover letter for sales job pdf', suggesting a social engineering lure to encourage clicks on the embedded malicious links.

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=cover+letter+for+sales+job+pdf
    • http://files.karachitutoring.com/uploads/1/3/0/8/130874379/8987959.pdf
    • http://files.yt8music.com/uploads/1/3/2/6/132682113/d2e800ca68976b.pdf
    • http://files.livingwaterclc.com/uploads/1/3/1/4/131483336/veleguxodefawoperem.pdf
    • https://cdn.shopify.com/s/files/1/0430/5122/1146/files/anterior_deltoid_programme.pdf
    • https://cdn.shopify.com/s/files/1/0440/3917/6357/files/87634835769.pdf
    • https://cdn.shopify.com/s/files/1/0451/6803/3946/files/accidental_death_of_an_anarchist_script.pdf
    • https://cdn.shopify.com/s/files/1/0435/6135/3371/files/gagogezor.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bararilisubolubudikolumo.pdf
    • https://cdn.shopify.com/s/files/1/0431/4592/0669/files/47253637033.pdf
    • https://cdn.shopify.com/s/files/1/0432/9970/0889/files/fadejosefezavu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6512/1695/files/star_wars_destiny_character_list.pdf
    • https://cdn.shopify.com/s/files/1/0433/6402/4479/files/43026854694.pdf
    • https://cdn.shopify.com/s/files/1/0437/1631/3242/files/92989536538.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3854/files/zowutoxatawovuriwefosewi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7739/2794/files/disutuzedowiwabinorugo.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_off000066d3.bin
634333fd02aebef66953b589c1d52520f80925ab2172e73585a2283314e17aef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66D3 5216 bytes
font_01_sfnt_off000078a3.bin
348a08ec2953d77d09df8fe54031182e0f067bce3dff46cf8c72cc4f35dfed40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78A3 10204 bytes

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