Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f0c985dc701edde…

MALICIOUS

PDF

38.8 KB Created: 2020-08-06 10:04:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbfdb1ca539e7442a691d15ce2969447 SHA-1: 83b9b1eae0fb8763dc1982a5ef298587fa3c618e SHA-256: 9f0c985dc701eddec28921e9baf7939132697e583435f3a0892cf794f1513e98
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains the same URL, suggesting an attempt to lure the user to malicious infrastructure. The presence of multiple shopify.com links indicates a link farm strategy to improve search engine visibility for the 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.cc/pify?keyword=political+caricature+by+alfred+mccoy+pdf
    • http://files.expertscontractor.com/uploads/1/3/0/7/130775350/8074392.pdf
    • http://files.rugport.com/uploads/1/3/1/6/131606366/67e667f9b968.pdf
    • http://files.write-mindedwoman.com/uploads/1/3/1/6/131607565/sarinejofoxan-zutotifit.pdf
    • https://cdn.shopify.com/s/files/1/0436/5054/7870/files/gazagiteguwokizalijesexob.pdf
    • https://cdn.shopify.com/s/files/1/0427/9818/6652/files/dafepowa.pdf
    • https://cdn.shopify.com/s/files/1/0435/3867/7924/files/rigezibuxixijogajevegize.pdf
    • https://cdn.shopify.com/s/files/1/0432/4206/1986/files/40302198842.pdf
    • https://cdn.shopify.com/s/files/1/0432/8616/7702/files/defedubejafofosetolot.pdf
    • https://cdn.shopify.com/s/files/1/0437/4921/2309/files/javascript_games_code.pdf
    • https://cdn.shopify.com/s/files/1/0434/6406/5190/files/fluke_5520a_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/1920/5789/files/ryobi_ex26_manual.pdf
    • https://cdn.shopify.com/s/files/1/0438/8611/7019/files/gewebepeda.pdf
    • https://cdn.shopify.com/s/files/1/0431/6659/7288/files/97597419681.pdf
    • https://cdn.shopify.com/s/files/1/0432/1266/9089/files/18990637846.pdf
    • https://cdn.shopify.com/s/files/1/0440/4012/6614/files/jenukiva.pdf
    • https://cdn.shopify.com/s/files/1/0430/6275/5490/files/21428450968.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_off000049a7.bin
acabf1dd0a8a376cd7d4099cc86569ee614ed9ee64eea93e0c10eb5f2b5de78b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x49A7 5144 bytes
font_01_sfnt_off00005b29.bin
defdf2e0545ce5435b62d056079a7fa13b5e8eb4bea22b8d950eafbcc21796c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B29 11224 bytes
font_02_sfnt_off00007fbf.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FBF 4324 bytes

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