Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d9f33c47013655…

MALICIOUS

PDF

45.3 KB Created: 2020-08-02 01:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2035be5a4dc36b8e7610e87e141287f3 SHA-1: 28e9512589575f628b49463987ec4d10e9430646 SHA-256: 76d9f33c47013655d47db9921fcbd62cea1fb43cd1a3384b9d39f3c5b1d3d16c
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains text related to a game walkthrough, likely a lure. The ML classifier strongly indicates maliciousness, and the PDF structure suggests it's designed to host and distribute external content, potentially leading to further compromise.

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=final+fantasy+1+walkthrough+gba
    • http://files.mysustainablefashion.com/uploads/1/3/1/4/131454581/nefulep.pdf
    • http://files.aeebeh.net/uploads/1/3/1/1/131163872/pevasubipidekixuw.pdf
    • http://files.sacredheartlibrary.com/uploads/1/3/2/8/132815753/tawazevedekuxow.pdf
    • http://files.brandonmoorecomposition.com/uploads/1/3/2/7/132740997/2f286046ab86f2d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/59022585862.pdf
    • https://cdn.shopify.com/s/files/1/0438/2107/2541/files/sedepuxemopupawukikorizo.pdf
    • https://cdn.shopify.com/s/files/1/0435/8068/6491/files/94316104936.pdf
    • https://cdn.shopify.com/s/files/1/0435/2137/6410/files/5280263328.pdf
    • https://cdn.shopify.com/s/files/1/0429/1703/6198/files/muritixivevelegokefulilu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8671/6830/files/83092007266.pdf
    • https://cdn.shopify.com/s/files/1/0430/0128/2719/files/terraria_armored_cavefish.pdf
    • https://cdn.shopify.com/s/files/1/0432/1991/0811/files/bilawasesowulinusojut.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53446206952.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006570.bin
40182b498bb0e1d802b103c057eb2dedb1abf946814fe55a0b4e70a29b55a648		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6570 5200 bytes
font_01_sfnt_off00007731.bin
79da8a968711326a651bb5663cd217fb513f9d29d2d2373cf84772213ae96dcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7731 10348 bytes
font_02_sfnt_off00009aa2.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AA2 4324 bytes

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