Malicious PDF — malware analysis report

Static analysis result for SHA-256 13221cf1d0066c82…

MALICIOUS

PDF

44.4 KB Created: 2020-08-15 07:32:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ca2516f8aaeadce88b7c588637c4bd08 SHA-1: 52cb0ec24505bc7a8e8bbcf2d4755ec8fce1ce57 SHA-256: 13221cf1d0066c82d5edaf162faad924bc61ae7f2496419f809179912f6d8984
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to a link farm infrastructure, with one specifically leading to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirector, suggesting a lure to external malicious content.

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=australian+cadets+uniform
    • http://files.soundwavescape.com/uploads/1/3/0/9/130970008/b335b.pdf
    • http://files.embrandon.com/uploads/1/3/1/0/131070845/nosenuzesaba.pdf
    • http://files.andrewanddeannafriesen.org/uploads/1/3/0/8/130813510/losamafapo_doxedowoporumi.pdf
    • http://files.roanmountainglass.com/uploads/1/3/0/8/130874559/wujetenepukopez-pefovupesepitag-pokimaput.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/7923/6773/files/62787749984.pdf
    • https://cdn.shopify.com/s/files/1/0431/3907/2161/files/todomutogubawajejafolexu.pdf
    • https://cdn.shopify.com/s/files/1/0430/8110/5575/files/60745707660.pdf
    • https://cdn.shopify.com/s/files/1/0429/6055/2085/files/ruxusegelawetefebut.pdf
    • https://cdn.shopify.com/s/files/1/0432/8026/9462/files/sajetirajiruzefuxupi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5476/8021/files/60743267040.pdf
    • https://cdn.shopify.com/s/files/1/0432/9173/8277/files/building_data_pipelines_with_python.pdf
    • https://cdn.shopify.com/s/files/1/0434/7186/3961/files/los_angeles_sightseeing_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/5519/4011/files/lomekusepitefabuwote.pdf
    • https://cdn.shopify.com/s/files/1/0432/7810/6779/files/36604602906.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dobemajafapurotexujebo.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_off000071eb.bin
e7270864ed37e2415e92baf07ad2c640bed9c2a04a43e7693c896e4bf8c6ad54
pdf-font-stream PDF embedded font (sfnt) at offset 0x71EB 5156 bytes
font_01_sfnt_off00008350.bin
44ab975f0afe253b4982a4ba41f5fcb17361303adfd2d5de55dc4a56f4f4c495
pdf-font-stream PDF embedded font (sfnt) at offset 0x8350 9880 bytes