Malicious PDF — malware analysis report

Static analysis result for SHA-256 496e9b385b17c5ce…

MALICIOUS

PDF

39.9 KB Created: 2020-08-09 21:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7d43e5c5c585b25ea3d6fd50a065494 SHA-1: d487a26f5a593025a13021f06c1cc6f4044665a5 SHA-256: 496e9b385b17c5ceef76cb52dfb7065278ee6667eb884d0fdb8cc7468fb6cdc9
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.com). Another critical heuristic indicates the PDF acts as a link farm, hosting a large number of external PDF links, many of which are hosted on Shopify domains. The document body contains text related to 'material requirement planning pdf nptel' and the wkhtmltopdf application, suggesting a lure to entice users to click on the embedded links.

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=material+requirement+planning+pdf+nptel
    • http://dumolebi.belerionbijoux.com/uploads/1/3/1/4/131408970/667719.pdf
    • http://tuseneje.nalomelihoney.com/uploads/1/3/2/6/132681579/9534072.pdf
    • http://files.midcom-group.com/uploads/1/3/0/7/130776265/dokob-fakivibo-suguza.pdf
    • http://files.3sistersgrace.com/uploads/1/3/2/6/132696210/c1a97.pdf
    • https://cdn.shopify.com/s/files/1/0428/9688/3868/files/kulajarufafevuxakor.pdf
    • https://cdn.shopify.com/s/files/1/0434/6124/7129/files/breathing_exercises_for_panic_attacks.pdf
    • https://cdn.shopify.com/s/files/1/0429/5216/3481/files/63319335059.pdf
    • https://cdn.shopify.com/s/files/1/0430/4322/5751/files/64334786427.pdf
    • https://cdn.shopify.com/s/files/1/0440/4061/8134/files/sagowogegijorukulakaxuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/3059/4204/files/93492581105.pdf
    • https://cdn.shopify.com/s/files/1/0434/5217/0392/files/bogefeliwebunilutiraxuwi.pdf
    • https://cdn.shopify.com/s/files/1/0434/3165/7624/files/amazon_rainforest_fire_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/1357/0709/files/34717259594.pdf
    • https://cdn.shopify.com/s/files/1/0438/3732/5462/files/2985195143.pdf
    • https://cdn.shopify.com/s/files/1/0432/6945/6028/files/pexirivuwu.pdf
    • https://cdn.shopify.com/s/files/1/0428/3033/2060/files/fezepumewunalatebunapag.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005167.bin
dddbbe8582c985e1ebefa36d00deb6a2eb101e9d18c4bb70c51cb66d3d5a0985		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5167 5084 bytes
font_01_sfnt_off00006289.bin
d7b7bb941d1ade8b1cd124497c415d01b3235371326212a214d2c36a5d72f009		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6289 10000 bytes
font_02_sfnt_off0000848c.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x848C 4324 bytes

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