Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc94c0012c3c5488…

MALICIOUS

PDF

43.4 KB Created: 2020-08-06 22:30:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ecd3613146998d27df4b28529f59ea06 SHA-1: dc9a6f05d32c49b88af0eb1a94c292620dfa3a03 SHA-256: bc94c0012c3c5488b4a42e2a47010d7303a244c259cf9d414449dfe52f572f62
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many pointing to Shopify domains, but one critical link directs to `ttraff.ru`, identified as a malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the URL `https://ttraff.ru/pify?keyword=assassins+musical+pdf`, suggesting a lure related to the 'Assassins musical'. The presence of a malicious redirector indicates an attempt to lead the user to a harmful 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.ru/pify?keyword=assassins+musical+pdf
    • http://files.westsoundgreenstem.net/uploads/1/3/0/7/130739571/bebixuvajaxiredumo.pdf
    • http://files.unfinishededucation.com/uploads/1/3/2/6/132682676/7dbb3.pdf
    • http://files.annishealinggarden.com.au/uploads/1/3/0/7/130776864/kuxafixogudaruwuje.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/18983443830.pdf
    • https://cdn.shopify.com/s/files/1/0431/1410/2950/files/90711302556.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0813/files/psychology_chapter_2_class_12.pdf
    • https://cdn.shopify.com/s/files/1/0435/7554/1919/files/10294573322.pdf
    • https://cdn.shopify.com/s/files/1/0429/3469/8147/files/27250899950.pdf
    • https://cdn.shopify.com/s/files/1/0434/0154/3830/files/weekly_planner_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/6740/0601/files/wodil.pdf
    • https://cdn.shopify.com/s/files/1/0433/7496/8997/files/24226078300.pdf
    • https://cdn.shopify.com/s/files/1/0437/1139/8041/files/lovenoguzafasozujogexe.pdf
    • https://cdn.shopify.com/s/files/1/0441/3282/7288/files/17178026787.pdf
    • https://cdn.shopify.com/s/files/1/0435/2134/3647/files/93815993412.pdf
    • https://cdn.shopify.com/s/files/1/0431/4244/7261/files/ralesanizoja.pdf
    • https://cdn.shopify.com/s/files/1/0431/3622/1341/files/42841297486.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/1/0441/3282/7288/fi

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c30.bin
8ae6f7a06fda074b9367ba928bb3543f938dd64d6a290f99ad4ffbb66268464e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C30 5196 bytes
font_01_sfnt_off00007dd2.bin
85388957ce3b6fb19d51185fa486944ca21ea8d7dd196d5ca29733e28b771b05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DD2 10208 bytes

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