Malicious PDF — malware analysis report

Static analysis result for SHA-256 9be1e6b545fc0c0a…

MALICIOUS

PDF

41.5 KB Created: 2020-08-21 10:16:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca60cad78ab00bf5eac0c6d2ab3b7005 SHA-1: 1cbc2cd497be8554e094bb4a196c3ad85ffde179 SHA-256: 9be1e6b545fc0c0aab1b68788576a440a0cbf26afe737411f27158d3d37ff3c2
152 Risk Score

Malware Insights

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

The PDF contains a link that redirects to a known malicious domain, disguised with a lure related to job applications. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the malicious nature of the redirector. The PDF also contains a large number of embedded links, many pointing to Shopify, suggesting a link farm or SEO poisoning attempt to increase visibility of the malicious content. No scripts were extracted, but the primary attack vector is the malicious redirector.

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/pify?keyword=cv+template+for+student+part+time+job
    • http://files.studiosfinearts.com/uploads/1/3/1/4/131437778/2232473.pdf
    • https://cdn.shopify.com/s/files/1/0433/5940/4197/files/payback_2_mod_apk_android_1.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87932640634.pdf
    • https://cdn.shopify.com/s/files/1/0432/1044/0862/files/71215469120.pdf
    • https://cdn.shopify.com/s/files/1/0429/1916/6119/files/77230388206.pdf
    • https://cdn.shopify.com/s/files/1/0427/6345/2583/files/bula_buscofem.pdf
    • https://cdn.shopify.com/s/files/1/0433/8342/3126/files/7267437743.pdf
    • https://cdn.shopify.com/s/files/1/0432/5477/5970/files/multiplying_fractions_worksheets_6th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/mabopegakutuna.pdf
    • https://cdn.shopify.com/s/files/1/0437/1464/2069/files/26843091871.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zejakepujubuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/6707/1894/files/11730814747.pdf
    • https://cdn.shopify.com/s/files/1/0429/9508/9571/files/61672924426.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_off000063df.bin
b90eecafacecefc5d7d71609adfaa0fccc9e43a7e661ec9ac56a7ad04f232cb9
pdf-font-stream PDF embedded font (sfnt) at offset 0x63DF 5368 bytes
font_01_sfnt_off00007605.bin
7f776f9ca06a0c8ca741dad86bdf9d4390e562ea0839999e2f1ed25e3ef7f94d
pdf-font-stream PDF embedded font (sfnt) at offset 0x7605 10456 bytes