Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef76a08d170c2450…

MALICIOUS

PDF

51.0 KB Created: 2020-08-20 16:13:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31e250cadf35c6c433bbfe9a321df379 SHA-1: 41841f2177fdcb2e51b84b564ed9ecc3b9ca4328 SHA-256: ef76a08d170c2450d851d5eb094014ebe3628273929b9861a1ad58ed2c1eacff
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to sheet music and the malicious URL, suggesting a lure. The primary malicious URL is `https://ttraff.com/pify?keyword=braveheart+theme+sheet+music+piano`, which is likely used to redirect users to a malicious site. The presence of many Shopify links, some confirmed benign and others unknown, suggests a link farm technique to obscure the ultimate destination.

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=braveheart+theme+sheet+music+piano
    • http://lisotuzaf.prudhoelocalhistory.com/uploads/1/3/1/6/131636644/bexijuwazizu_nuburudafaxa.pdf
    • http://files.difonet.com/uploads/1/3/1/4/131406344/fewami.pdf
    • https://cdn.shopify.com/s/files/1/0427/4018/7303/files/49416547093.pdf
    • https://cdn.shopify.com/s/files/1/0428/4959/9651/files/lodakorigozoku.pdf
    • https://cdn.shopify.com/s/files/1/0448/3029/4177/files/angielski_sownik_tematyczny_lingo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8135/1839/files/all_american_reject_it_ends_tonight.pdf
    • https://cdn.shopify.com/s/files/1/0433/3692/5342/files/foxug.pdf
    • https://cdn.shopify.com/s/files/1/0437/7948/9946/files/weather_channel_springdale_arkansas.pdf
    • https://cdn.shopify.com/s/files/1/0438/2998/5430/files/solofumifazikakodukab.pdf
    • https://cdn.shopify.com/s/files/1/0429/9846/4661/files/19796728524.pdf
    • https://cdn.shopify.com/s/files/1/0432/8246/4928/files/kirelejarorifi.pdf
    • https://cdn.shopify.com/s/files/1/0428/3482/1287/files/11404596982.pdf
    • https://cdn.shopify.com/s/files/1/0447/1599/9386/files/curriculum_monitoring_and_evaluation.pdf
    • https://cdn.shopify.com/s/files/1/0433/4131/6249/files/mupadivom.pdf
    • https://cdn.shopify.com/s/files/1/0434/5059/7528/files/pudoligolexexetate.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_off00004b9b.bin
0749d0863211bb50c137caa5add629ea1545c985bb764edf2ee58eb55ce098a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B9B 20376 bytes
font_01_sfnt_off00008ab9.bin
bdfc7181cb421c1d03da7ab2888dce0b6b03c88694d546a1e4bf8d0bc8048c7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AB9 5252 bytes
font_02_sfnt_off00009c71.bin
3e57401301bf69d23609b57cb91b100156f1497c617a8a1e90433f2e4671104e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C71 10184 bytes

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