Malicious PDF — malware analysis report

Static analysis result for SHA-256 53db57aeaa2a24de…

MALICIOUS

PDF

50.5 KB Created: 2020-08-20 19:43:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0f9d4cf9556a248c471e3d1da8755e5 SHA-1: bd95d9581170aaedcd3b8e82a3d46ec6ba6e4e2d SHA-256: 53db57aeaa2a24ded47458b372e305876cbbd44802777175bd4c7b495363fc0f
154 Risk Score

Malware Insights

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

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 ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and references to other PDFs, suggesting a link farm designed to obscure the true destination and potentially distribute further malicious content or conduct phishing.

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=adb+road+full+form
    • http://files.jadestemple.com/uploads/1/3/2/7/132712034/5019994.pdf
    • http://xekem.janinagoldberg.com/uploads/1/3/1/3/131379578/kefivete.pdf
    • http://jekovu.lwcmusic.org/uploads/1/3/0/8/130874276/nadafageluxase-vomemanetuniliv-zewivafur-ralipokesakames.pdf
    • https://cdn.shopify.com/s/files/1/0434/0744/2072/files/the_pigman.pdf
    • https://cdn.shopify.com/s/files/1/0439/8183/2350/files/revud.pdf
    • https://cdn.shopify.com/s/files/1/0438/1471/5554/files/kasubiruvubakawowuratokiw.pdf
    • https://cdn.shopify.com/s/files/1/0428/2518/7491/files/vapuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/5743/1196/files/42465994748.pdf
    • https://cdn.shopify.com/s/files/1/0432/3488/5792/files/biserenuxofofitegefaxoxex.pdf
    • https://cdn.shopify.com/s/files/1/0432/2571/0750/files/tepoxibinupezipopin.pdf
    • https://cdn.shopify.com/s/files/1/0435/8206/2753/files/70205463298.pdf
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/gevotozebamu.pdf
    • https://cdn.shopify.com/s/files/1/0428/1332/5471/files/28783441796.pdf
    • https://cdn.shopify.com/s/files/1/0440/2587/2549/files/78648172466.pdf
    • https://cdn.shopify.com/s/files/1/0437/6992/1688/files/toximodiwotito.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071a8.bin
b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71A8 2828 bytes
font_01_sfnt_off00007ba3.bin
b0b4c0e318bc51f1fc9865b18f556f9a488ba6a59b128ed0ebbfa3d9ceb7a36d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BA3 4536 bytes
font_02_sfnt_off00008b00.bin
9463e11595fe6e9722e7e60b457cb22442e7821f301e76241bb5dd9decb02c1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B00 9984 bytes
font_03_sfnt_off0000acdc.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xACDC 4324 bytes

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