Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cf275c952a4fa4b…

MALICIOUS

PDF

39.1 KB Created: 2020-08-01 15:24:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d9b0e265fa6c8d972720faf736473064 SHA-1: af5eeb5f5f6c169cb9998daf1634f326772db830 SHA-256: 7cf275c952a4fa4b423669d9a56b9d8bb706e5fcf564010dde77ac27f1bd1a06
152 Risk Score

Malware Insights

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

The PDF document contains a significant number of embedded links, forming a link farm. One of these links, 'https://ttraff.ru/pify?keyword=calculate+color+gradient+javascript', is known to point to malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body appears to be obfuscated or corrupted, but the presence of the malicious redirector URL is the primary indicator of 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.ru/pify?keyword=calculate+color+gradient+javascript
    • http://files.artsypartync.com/uploads/1/3/1/1/131164236/a64f0b42c30a94.pdf
    • http://files.wonderlablearning.com/uploads/1/3/0/7/130776449/9285949.pdf
    • http://files.cookedwithhart.com/uploads/1/3/0/9/130969889/lamorus.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/15900382268.pdf
    • https://cdn.shopify.com/s/files/1/0440/4068/3685/files/kopajipekifuxoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/84574839703.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2802/files/nosir.pdf
    • https://cdn.shopify.com/s/files/1/0430/1442/2677/files/bonivisaladobimivawi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6127/2995/files/22260788974.pdf
    • https://cdn.shopify.com/s/files/1/0436/9481/7435/files/22032218108.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27622062760.pdf
    • https://cdn.shopify.com/s/files/1/0436/3547/4590/files/bakatirilelogiwofu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6321/3209/files/21538805425.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_off00004fdb.bin
759544a557dd6e31ccbb28dd2560c1dfe0a4586def57c3bec2d4015f8c937cf6
pdf-font-stream PDF embedded font (sfnt) at offset 0x4FDB 5280 bytes
font_01_sfnt_off000061e9.bin
74c746215324d7aa56aae55fa6a1116fb001f89626d05e1dc693aba91a21ea4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x61E9 14620 bytes