Malicious PDF — malware analysis report

Static analysis result for SHA-256 d33a8539a63f9d25…

MALICIOUS

PDF

44.2 KB Created: 2020-08-30 16:50:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00680185f27481fb7bb4692243e731d7 SHA-1: 0a31061c74037df754692fd95379e8cad82ff1de SHA-256: d33a8539a63f9d25ac0baee0e0f6e7941e228d05c6b1c44e69ac7ad277aefd36
150 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to a link farm infrastructure. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.cc/wix?keyword=purple+shorts+stardew+valley'. The document body is heavily obfuscated and contains what appears to be junk data, suggesting its primary purpose is not to convey information but to host these malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.cc/wix?keyword=purple+shorts+stardew+valley
    • https://static.usrfiles.com/ugd/0dd040_5d2496f6899f48c59b5ca2ed2f8227b5.pdf
    • https://static.usrfiles.com/ugd/b8c837_9631e454f8c64eb89350741a13eb1129.pdf
    • https://static.usrfiles.com/ugd/8acad3_40c8107ca62a41739ac1cb71b7254034.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_b685b2923198453ea0eac2e37b10ca3f.pdf
    • https://static.usrfiles.com/ugd/b8c837_39b62fde182245a490cdfdb8545c9830.pdf
    • https://static.usrfiles.com/ugd/a18aa6_e2b35bde1b3f4b1da7eb26ab5460c864.pdf
    • https://static.usrfiles.com/ugd/e3ff21_a879806028f7412289799ad321205565.pdf
    • https://static.usrfiles.com/ugd/0baf77_480d51cc514546feb221e64fa77e3be1.pdf
    • https://cdn.shopify.com/s/files/1/0438/8097/2456/files/ninja_training_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/1997/6350/files/autoestima_en_los_adolescentes.pdf
    • https://cdn.shopify.com/s/files/1/0437/8699/3813/files/apologia_de_socrates_gredos.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tizerosotusalasebix.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/12686110393.pdf
    • https://cdn.shopify.com/s/files/1/0431/7003/7924/files/self_assigned_ip_address.pdf
    • https://cdn.shopify.com/s/files/1/0434/8100/6244/files/skunk_anansie_hedonism_guitar.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006124.bin
9d74f664f29a0e793253d03fbcbd1e1049fbbe257625ef94e8bb74c17da840dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6124 5028 bytes
font_01_sfnt_off0000726b.bin
062bc80cbca40e957b2ee370c80b0eb8faf1d88b5d25e02a13a6546972c87e1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x726B 10484 bytes
font_02_sfnt_off0000960c.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x960C 4324 bytes