Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a41f4aaf27146d6…

MALICIOUS

PDF

43.9 KB Created: 2020-07-31 06:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb0acb3832e24fc5f7d8bb24f76f3df2 SHA-1: 16d23cf9134ade68fd48648706a433799d34bba6 SHA-256: 3a41f4aaf27146d65ffb2fa1192d980dbe131f0771d5bed79e016b55442ee7ba
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=abstract+reasoning+pdf+free'. This indicates an attempt to redirect the user to a malicious site. The document body, though heavily obfuscated, contains text related to 'abstract reasoning pdf free', reinforcing the lure. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to increase visibility and traffic to the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=abstract+reasoning+pdf+free
    • http://files.gahaganknives.com/uploads/1/3/2/3/132303175/9988307.pdf
    • http://files.algonkinflyfishers.com/uploads/1/3/0/9/130969192/7654849.pdf
    • http://files.xandergibb.com/uploads/1/3/0/7/130738924/9538861.pdf
    • https://cdn.shopify.com/s/files/1/0437/3767/7989/files/70759652194.pdf
    • https://cdn.shopify.com/s/files/1/0440/6509/5845/files/4839994877.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2465/files/55171903982.pdf
    • https://cdn.shopify.com/s/files/1/0434/5266/1912/files/givejesep.pdf
    • https://cdn.shopify.com/s/files/1/0431/1174/3639/files/89396347799.pdf
    • https://cdn.shopify.com/s/files/1/0428/8941/2764/files/74873326782.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/25071383095.pdf
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/pirajada.pdf
    • https://cdn.shopify.com/s/files/1/0429/3656/5923/files/62028431565.pdf
    • https://cdn.shopify.com/s/files/1/0432/0706/5757/files/xefuvevifun.pdf
    • https://cdn.shopify.com/s/files/1/0431/0004/5469/files/febofelasusitavisivures.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/
    • https://cdn.shopify.com/s/files/1/0431/1174/3

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006f35.bin
14179af664e00dcd6324e9652d3d30b7e1a8dad32a0da995b815e7ed5025afde		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F35 5208 bytes
font_01_sfnt_off000080e4.bin
43587c3eca0d59792d949ef923bb005aebac1f914dd353ecf10a4256ea456f6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80E4 9976 bytes

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