Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a9cf8290d7a1513…

MALICIOUS

PDF

36.1 KB Created: 2020-08-21 12:12:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d173f16858d8364415f4be891be96adb SHA-1: bbea0cd58eb46e23957bcef3a130bfccbecbce5f SHA-256: 0a9cf8290d7a15134b715a99cd5c758943ff3b00c7bd597f502b3aedd99dc7ad
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, ttraff.ru, which is presented as a search result for 'baby song ringtone 2018'. The document also hosts a large number of other PDF files on Shopify domains, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicates maliciousness, and the embedded URL is the primary vector for this attack.

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=baby+song+ringtone++2018
    • http://files.sassyfrassboutique.org/uploads/1/3/2/8/132816195/vogebaxovitug-dosaxos-fenuku-wanixis.pdf
    • http://files.cantyschool.org/uploads/1/3/0/7/130776245/dokivewuwa.pdf
    • http://kawuj.4yournextstep.com/uploads/1/3/1/8/131858530/tipikeba_benugezuwukere_buwunolan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/2992/8872/files/camera_app_for_pc_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0449/7945/4111/files/spandana_application_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/8148/9818/files/miwosusegesoboza.pdf
    • https://cdn.shopify.com/s/files/1/0434/0501/7255/files/37559654669.pdf
    • https://cdn.shopify.com/s/files/1/0462/0075/0233/files/stamps_and_stamp_collecting_hobby_guides.pdf
    • https://cdn.shopify.com/s/files/1/0438/9647/1707/files/zadofaziwewomibuvuvizixud.pdf
    • https://cdn.shopify.com/s/files/1/0428/3462/4679/files/70755613460.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5505/files/jorobamebosajupemikuxizu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4960/7590/files/23841639264.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bifivejeg.pdf
    • https://cdn.shopify.com/s/files/1/0437/5907/5477/files/bootstrap_css_tutorial_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0430/5652/9557/files/64677251422.pdf
    • https://cdn.shopify.com/s/files/1/0434/3093/6733/files/kipitovazedisunubovim.pdf
    • https://cdn.shopify.com/s/files/1/0433/1329/9620/files/4520790586.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_off00004ea0.bin
95885d0000e57fb30ec440e2f1af73068f48cc6275a23a2dade3a60116f6bdf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4EA0 5632 bytes
font_01_sfnt_off000061e1.bin
63fe15dd1880affd6660416ac9198c29060f20f1fb7ded40930568f712b04e9f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61E1 9852 bytes

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