Malicious PDF — malware analysis report

Static analysis result for SHA-256 c503987bfcd9b0e5…

MALICIOUS

PDF

42.9 KB Created: 2020-08-02 01:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 117337d8d135288a98ed557e569b0935 SHA-1: 796e1f9534c4db6bd8b41b69c792e5279a47391e SHA-256: c503987bfcd9b0e51ac77da816ab8ff622c3c048cb36f591161796cedc32e252
152 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO poisoning tactic. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/pify?keyword=21+jump+street+watch+online+free'. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same lure text and URL, reinforcing the malicious intent.

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=21+jump+street+watch+online+free
    • http://files.rmofparkdale498.com/uploads/1/3/0/8/130873717/318bb3.pdf
    • http://files.lillianchun.com/uploads/1/3/2/7/132710627/8885472.pdf
    • http://files.mindyleanse.com/uploads/1/3/0/8/130874307/tozekawupak-janamenuv.pdf
    • http://files.jimpendergrass.com/uploads/1/3/2/8/132815961/xabixejeje-nenowapiwage-jisematonalon.pdf
    • https://cdn.shopify.com/s/files/1/0440/5503/6054/files/gidepisavox.pdf
    • https://cdn.shopify.com/s/files/1/0431/7849/2072/files/bebawatevife.pdf
    • https://cdn.shopify.com/s/files/1/0432/5015/5688/files/13471874849.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/fexofedome.pdf
    • https://cdn.shopify.com/s/files/1/0437/3459/7784/files/20724974719.pdf
    • https://cdn.shopify.com/s/files/1/0429/5966/7363/files/relotup.pdf
    • https://cdn.shopify.com/s/files/1/0428/2348/3548/files/desokewukazoxipobed.pdf
    • https://cdn.shopify.com/s/files/1/0427/4287/4278/files/pignose_hog_30_manual.pdf
    • https://cdn.shopify.com/s/files/1/0431/0728/7197/files/41254069380.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/35787155585.pdf
    • https://cdn.shopify.com/s/files/1/0428/2132/0870/files/vututijob.pdf
    • https://cdn.shopify.com/s/files/1/0433/0048/7332/files/20914678421.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_off00006875.bin
2022e41c6dcf1f3b9f0ce3893160828a2372deb5b58cbb510385fc273a66d448
pdf-font-stream PDF embedded font (sfnt) at offset 0x6875 5512 bytes
font_01_sfnt_off00007b26.bin
b4c2de1d8a3bd147d6f26fa9a3c2925bc1a380f232090e096a57f3afdcb22073
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B26 10532 bytes