Malicious PDF — malware analysis report

Static analysis result for SHA-256 692bc28ff2fac5ee…

MALICIOUS

PDF

52.4 KB Created: 2020-08-05 05:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1d4ac9c83befcc601ec7d2a00e727e6 SHA-1: 25c4e13e7b5e7cd576eced961680e2bc351ddab4 SHA-256: 692bc28ff2fac5ee57d4a4c0bd236ba839bc3253535f65f83b68470a1f183f59
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a 'pet listening answer sheet'. This suggests the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

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=pet+listening+answer+sheet+pdf
    • http://files.derwoodmarket.org/uploads/1/3/1/3/131380625/243071.pdf
    • http://files.extremeluxurygetaways.com/uploads/1/3/1/3/131379040/gasixada.pdf
    • http://desojave.strikesforkidsseattle.com/uploads/1/3/1/0/131070786/rogareputofozezela.pdf
    • http://files.1201third.com/uploads/1/3/1/4/131483154/kapudomelotuj-nasumalu-zusij-nuludavavedev.pdf
    • http://files.carriedolan.com/uploads/1/3/0/7/130776864/9017134.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4291/3955/files/17983560049.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90685913575.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5814/files/nimukiguwogivev.pdf
    • https://cdn.shopify.com/s/files/1/0433/9246/7109/files/waneberonimisatatika.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bugos.pdf
    • https://cdn.shopify.com/s/files/1/0431/0433/8074/files/briggs_and_stratton_5500_watt_generator.pdf
    • https://cdn.shopify.com/s/files/1/0430/3428/0099/files/rerebujevupemaled.pdf
    • https://cdn.shopify.com/s/files/1/0435/0866/2440/files/event_horizon_torrent.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jedajuzosefowi.pdf
    • https://cdn.shopify.com/s/files/1/0428/0261/0335/files/38496037397.pdf
    • https://cdn.shopify.com/s/files/1/0431/6240/2967/files/telangana_election_results_2020_constituency_wise.pdf
    • https://cdn.shopify.com/s/files/1/0430/4538/8437/files/7828503713.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_off00008e3d.bin
62ae4c4b2aebbcc9cc7938d1bfacb986f19eb5f2a7cdb7912349d64c102930d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E3D 5396 bytes
font_01_sfnt_off0000a0a7.bin
d2c5f5d9d8f9d5693f717e4500ac346ac9aae2cfc4c5cfa3e72bce39512615c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA0A7 10404 bytes

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