Malicious PDF — malware analysis report

Static analysis result for SHA-256 635dc04d8ac26d7a…

MALICIOUS

PDF

41.9 KB Created: 2020-08-10 04:41:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 527fdcb10a8795f6223eafebc7ab13a6 SHA-1: d670e945def7536298299f13c45389194ef09fab SHA-256: 635dc04d8ac26d7ae37b8f51ef6078d40b0cdac33fe573f1d693abc05f09fa92
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link redirects to a known malicious domain, ttraff.com. This suggests the document is part of an SEO link farm or a content-spinning operation designed to host malicious content or redirect users to malicious sites. The ML classifier also strongly indicated maliciousness.

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=calligraphy+practice+book+for+beginners+with+worksheet+pdf
    • http://files.speckmath.net/uploads/1/3/1/4/131437666/daxomixolosotenon.pdf
    • http://files.maydaystudio.com/uploads/1/3/1/6/131637546/162127.pdf
    • http://files.b2w2.org/uploads/1/3/0/8/130874554/7810114.pdf
    • http://files.raphaelacademy.org/uploads/1/3/0/9/130970003/xufidisuxig.pdf
    • http://files.leverageleadership.org/uploads/1/3/1/8/131871618/fatopoxopovazib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/0123/3053/files/58899894792.pdf
    • https://cdn.shopify.com/s/files/1/0433/0638/5573/files/80318690679.pdf
    • https://cdn.shopify.com/s/files/1/0432/0247/8237/files/cricket_phones_walmart.pdf
    • https://cdn.shopify.com/s/files/1/0433/5871/6055/files/free_radicals_and_antioxidants.pdf
    • https://cdn.shopify.com/s/files/1/0431/9684/2142/files/gamedewita.pdf
    • https://cdn.shopify.com/s/files/1/0454/8096/8342/files/afrikaans_dictionary_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/9082/8700/files/27681068363.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/2283550224.pdf
    • https://cdn.shopify.com/s/files/1/0427/9799/0055/files/antagonista_y_agonista.pdf
    • https://cdn.shopify.com/s/files/1/0433/9659/5870/files/2894043453.pdf
    • https://cdn.shopify.com/s/files/1/0428/0070/9791/files/dopusin.pdf
    • https://cdn.shopify.com/s/files/1/0432/3196/9438/files/27416473140.pdf
    • https://cdn.shopify.com/s/files/1/0428/2246/7740/files/ratuxevokop.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_off00006199.bin
dce0871878a44dcc204b1200506fdc4a2b130f3f2895d174b22737f6020e81de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6199 5720 bytes
font_01_sfnt_off00007520.bin
345757cf5c6011cca728584afe2790e6f6953ef8bdcd17c6a526951696ae9601		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7520 10736 bytes

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