Malicious PDF — malware analysis report

Static analysis result for SHA-256 07b4a90b2ff869af…

MALICIOUS

PDF

41.9 KB Created: 2020-08-19 05:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0be3124cf6818dd9d1783a95cadd2241 SHA-1: 5216f61d9e01b2274166526c01a9982a41eaf5f9 SHA-256: 07b4a90b2ff869af625e763cbd9471cc3809e75c8207f3108e7894c76b090501
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded URLs, one of which, 'https://ttraff.ru/pify?keyword=apache+hadoop+yarn+pdf', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other benign-looking PDF links, suggesting a link farm or SEO poisoning tactic to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness.

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=apache+hadoop+yarn+pdf
    • http://vasetaz.carriebeleno.com/uploads/1/3/0/7/130775291/lurexobimuxor_zarujadamivipu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5572/7260/files/zirazalevagu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3876/9303/files/47523499732.pdf
    • https://cdn.shopify.com/s/files/1/0451/7157/2885/files/83800176056.pdf
    • https://cdn.shopify.com/s/files/1/0435/9005/8152/files/papipibujatozagew.pdf
    • https://cdn.shopify.com/s/files/1/0430/8215/4135/files/38409296621.pdf
    • https://cdn.shopify.com/s/files/1/0437/6464/6042/files/91918525497.pdf
    • https://cdn.shopify.com/s/files/1/0433/6022/3382/files/cambridge_essential_english_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0440/5719/8742/files/hamlet_monologue.pdf
    • https://cdn.shopify.com/s/files/1/0432/2341/6987/files/replace_belt_proform_treadmill.pdf
    • https://cdn.shopify.com/s/files/1/0437/8188/2013/files/13641695771.pdf
    • https://cdn.shopify.com/s/files/1/0431/7121/7565/files/bmw_i3_accessories.pdf
    • https://cdn.shopify.com/s/files/1/0436/2692/2146/files/fury_warrior_best_in_slot.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000677c.bin
10825245b40358ab79af785c7af9a01920552a0c309c0fc48c22ab7c2644d17f
pdf-font-stream PDF embedded font (sfnt) at offset 0x677C 5124 bytes
font_01_sfnt_off000078e5.bin
c437ba318f314f97f209a607a0f87492b032f5dc7303bd3ab283201fe42c6c9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x78E5 9936 bytes