Malicious PDF — malware analysis report

Static analysis result for SHA-256 353522401af8c3ea…

MALICIOUS

PDF

43.6 KB Created: 2020-07-29 20:09:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8d2454bdd152a26667b3a11dc29215a SHA-1: 57103e6a20b74203d8d3d75799e25f67f91bb487 SHA-256: 353522401af8c3ea14fb0827dac615031df5396e1ddb37f9622619fc3aeb7d75
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

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 indicates maliciousness. The document body appears to be malformed or heavily obfuscated, but the presence of numerous links suggests a link farm or redirection strategy to distribute malicious content.

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.ru/pify?keyword=corpus+juris+secundum+volume+7+pdf
    • http://files.no16cyclecaps.com/uploads/1/3/0/7/130740510/fotupufusodo_miribani.pdf
    • http://files.maritzavives.com/uploads/1/3/2/8/132815346/zotowelew_lotavapibo_zevubebesoden_sodagufeje.pdf
    • http://files.gorocketcity.org/uploads/1/3/0/9/130969146/furopagagebonetisuxa.pdf
    • http://files.caseyjohnsondesigns.com/uploads/1/3/0/7/130739864/6994137.pdf
    • http://files.honemadephotography.com/uploads/1/3/2/6/132695194/fanudofa.pdf
    • http://files.gorocketcity.org/uplo
    • https://cdn.shopify.com/s/files/1/0433/9829/9813/files/mutawekaze.pdf
    • https://cdn.shopify.com/s/files/1/0427/7082/5382/files/rujijirolizabezuxiki.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9477/files/8571066590.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31240515614.pdf
    • https://cdn.shopify.com/s/files/1/0428/5041/8847/files/gujubomusofiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/6335/3244/files/89943871915.pdf
    • https://cdn.shopify.com/s/files/1/0430/4715/7914/files/dubifig.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/60868594071.pdf
    • https://cdn.shopify.com/s/files/1/0433/9705/4631/files/jusamafiramomijadi.pdf
    • https://cdn.shopify.com/s/files/1/0436/7053/6345/files/lomimus.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5800/files/77176291584.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ac6.bin
9289c616dd2e4fdc6584b32b57ca9ae38e980c0f761e75b5383d467d6f9c34dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AC6 5132 bytes
font_01_sfnt_off00007c2e.bin
4d943b0b0756a694656b1b29eb4073e21e9758af2ae8710e6b2ca910de40ea25
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C2E 10312 bytes