Malicious PDF — malware analysis report

Static analysis result for SHA-256 609d37623f7ad3ce…

MALICIOUS

PDF

43.0 KB Created: 2020-08-09 13:57:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e614dc989a0340a3dfdf1f58e4a95ac8 SHA-1: 48ecfaba9dc637d9869f1af9abd6b6ab7d4f66af SHA-256: 609d37623f7ad3ce2e2478b7564d88aa3781b83e63aa2c3af4fe5de21d07d39e
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many pointing to PDF files hosted on Shopify and other domains, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.com/pify?keyword=pasto+brizantha+pdf, which likely serves as a gateway to further malicious content. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=pasto+brizantha+pdf
    • http://mepata.landmarkpublicart.com/uploads/1/3/2/6/132681352/87f2d615eb12eb.pdf
    • http://files.southtownscatholic.org/uploads/1/3/1/6/131636990/3996155.pdf
    • http://tilojimew.christine-keeler.co.uk/uploads/1/3/0/9/130969744/fatawu-seneki-diwimeg.pdf
    • http://files.collaborativeteachersinstitute.com/uploads/1/3/0/7/130740521/nuriv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57355052908.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/95818232703.pdf
    • https://cdn.shopify.com/s/files/1/0434/2326/9014/files/fokakemubol.pdf
    • https://cdn.shopify.com/s/files/1/0432/5530/0249/files/60297811608.pdf
    • https://cdn.shopify.com/s/files/1/0438/1789/4050/files/descriptive_statistics_thesis.pdf
    • https://cdn.shopify.com/s/files/1/0433/4131/6249/files/current_affairs_cloud_download.pdf
    • https://cdn.shopify.com/s/files/1/0434/1553/5774/files/82274915571.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/74731072541.pdf
    • https://cdn.shopify.com/s/files/1/0437/4649/2565/files/52356449093.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32150460784.pdf
    • https://cdn.shopify.com/s/files/1/0438/0455/7472/files/xemofiguku.pdf
    • https://cdn.shopify.com/s/files/1/0435/2180/2404/files/18689205008.pdf
    • https://cdn.shopify.com/s/files/1/0437/1726/3510/files/moboximopikexa.pdf
    • https://cdn.shopify.com/s/files/1/0429/6205/9427/files/37285504473.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_off00006a4a.bin
0de15cb618fdd4dba53f76697eeeef11014fc5a52226feaecb6c8ae1c847ebec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A4A 5288 bytes
font_01_sfnt_off00007c3e.bin
1702b6281ed21f291e38174fcabc80ee232f597e2fb91ee26634f909aa727653		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C3E 10336 bytes

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