Malicious PDF — malware analysis report

Static analysis result for SHA-256 f079a09fa3c9bda6…

MALICIOUS

PDF

57.1 KB Created: 2020-08-19 13:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da8f1806a93a27ecbfc05d6753dbfcde SHA-1: 67cba7e387a447eec83d128c207134838feb84fc SHA-256: f079a09fa3c9bda691d7cc096925f3339ad906b2160ae6c329c6034875940e09
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text that appears to be a lure for film songs, likely to disguise the malicious intent. The presence of multiple Shopify URLs suggests an attempt to blend malicious links with benign ones, a common tactic in SEO poisoning or link farm attacks. No scripts were extracted, but the PDF structure itself is used to host and deliver the malicious links.

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.com/pify?keyword=bhakta+prahlada+tamil+film+songs
    • http://pevipijir.runtogetlucky.com/uploads/1/3/0/9/130969426/nolosix.pdf
    • https://cdn.shopify.com/s/files/1/0432/7142/2115/files/62185188289.pdf
    • https://cdn.shopify.com/s/files/1/0436/7217/4745/files/finuvozujis.pdf
    • https://cdn.shopify.com/s/files/1/0429/8362/0767/files/annamalai_university_dde_textbooks.pdf
    • https://cdn.shopify.com/s/files/1/0430/4296/3613/files/rpg_maker_mv_igg.pdf
    • https://cdn.shopify.com/s/files/1/0430/3536/1442/files/47654246424.pdf
    • https://cdn.shopify.com/s/files/1/0435/8701/0715/files/fafinamubusotupi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1305/3338/files/manual_weed_wacker.pdf
    • https://cdn.shopify.com/s/files/1/0462/4433/1680/files/47519295525.pdf
    • https://cdn.shopify.com/s/files/1/0439/4303/5048/files/youtube_to_mp4_1080p_60fps.pdf
    • https://cdn.shopify.com/s/files/1/0431/3926/8765/files/fagawuxa.pdf
    • https://cdn.shopify.com/s/files/1/0432/6578/6006/files/90873413909.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/22542469070.pdf
    • https://cdn.shopify.com/s/files/1/0432/4796/0232/files/wapking._in_mp4_songs_free.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_off00008538.bin
e2672dd6018ab784552d16782e02d576a02a25391ffb6d3f3191071c35b7e130		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8538 5568 bytes
font_01_sfnt_off000097fb.bin
e45f0e88ae0aae61a4c01d9d0aa85b055e8a1f3c481fca23bd79be3d53f51f7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x97FB 9836 bytes
font_02_sfnt_off0000b46e.bin
c3b8de5368f2be2ace8a6586e725e7b6669c4848f06d0ffd7d2b3cfb505a4074		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB46E 10156 bytes

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