Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc88ad717aede62a…

MALICIOUS

PDF

45.5 KB Created: 2020-08-03 19:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0cead73e388d2f04e6020ac2bdeaa653 SHA-1: e2cafda65fb802436ad74a3938238ca9b9c7303f SHA-256: cc88ad717aede62a1203ec58a0d4f8bde15cabf2b00162ff2e91a280cc53d62f
152 Risk Score

Malware Insights

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

The PDF contains a deceptive lure, presenting itself as a free download for 'Railway psychological test books'. It embeds numerous links, with the primary one redirecting to malicious infrastructure at `ttraff.cc`. This suggests a phishing or scam attempt designed to lead users to harmful content. No scripts were extracted, and the document body is heavily obfuscated, but the presence of a malicious redirector and a link farm strongly indicates 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.cc/pify?keyword=railway+psychological+test+books+pdf+free+download+in+english
    • http://files.heartlandzen.org/uploads/1/3/1/3/131397973/gibujiserabaref.pdf
    • http://files.redmousedesigns.com/uploads/1/3/1/4/131454090/4f681.pdf
    • http://files.coveredplanet.com/uploads/1/3/2/7/132740291/somatokesoralar-dikagujobikiz-siferulakava.pdf
    • https://cdn.shopify.com/s/files/1/0429/7526/4919/files/51746272324.pdf
    • https://cdn.shopify.com/s/files/1/0434/4011/1782/files/zixiluloduwizim.pdf
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/judiputesasimogidiwusez.pdf
    • https://cdn.shopify.com/s/files/1/0431/4926/3005/files/36647218348.pdf
    • https://cdn.shopify.com/s/files/1/0437/9043/4456/files/9368899801.pdf
    • https://cdn.shopify.com/s/files/1/0440/1774/6070/files/xitiva.pdf
    • https://cdn.shopify.com/s/files/1/0431/5811/0363/files/critical_strike_no_cooldown_script.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1791/files/bewirifesibalekojitap.pdf
    • https://cdn.shopify.com/s/files/1/0431/1315/2673/files/number_2_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0435/8746/9471/files/bupariligibamuroxukege.pdf
    • https://cdn.shopify.com/s/files/1/0435/7311/7091/files/zojajemumurevegivumer.pdf
    • https://cdn.shopify.com/s/files/1/0432/1542/1599/files/wekuxux.pdf
    • https://cdn.shopify.com/s/files/1/0431/2314/6906/files/devulufi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6173/0719/files/jutokokiziruwozu.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_off000058e3.bin
ad34777eba81cb01a644b296d27002d5339acaf792a26a3bc7a93952b00c1fea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58E3 5824 bytes
font_01_sfnt_off00006cc0.bin
33d80b5e357abfa3ea91f5eff18928953f8e36d8e9a7aea158c838e8ae756dd9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC0 2116 bytes
font_02_sfnt_off0000768a.bin
d24d1d977bd9029dde938dbefc6bc5d35bf1392ad18c538e61637ab25c51de1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x768A 15372 bytes

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