Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e2f5317c0515bdd…

MALICIOUS

PDF

73.4 KB Created: 2020-08-10 08:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4aaf2efc259d27553d4b7fe65bb8a2b6 SHA-1: a03d9ce24844a3844437a4cf810b8bb08b2b6154 SHA-256: 5e2f5317c0515bdd649ac6eb068548ecbbf076e37b011d7ffd28aab85134d60a
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to benign Shopify URLs, but one critical link directs to a known malicious redirector. The document body, though heavily obfuscated, contains the URL that triggers the malicious redirector. This suggests a phishing or malware distribution attempt, likely using the 'pharmacology mnemonics' lure to entice clicks.

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.cc/pify?keyword=pharmacology+mnemonics+antibiotics+pdf
    • http://files.iliasvasilos.com/uploads/1/3/0/7/130776183/xigisozerubedoku.pdf
    • http://nujixolat.allotmentphotogallery.com/uploads/1/3/0/8/130814297/7653389.pdf
    • http://wulima.coburghighhistorical.org/uploads/1/3/1/6/131606289/medewovimelos_vuvirerabod_nejafulates_gokoposuti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7347/0618/files/5491629453.pdf
    • https://cdn.shopify.com/s/files/1/0431/7573/9560/files/femisa.pdf
    • https://cdn.shopify.com/s/files/1/0429/5000/0791/files/xavusajuku.pdf
    • https://cdn.shopify.com/s/files/1/0437/7241/2055/files/79186653130.pdf
    • https://cdn.shopify.com/s/files/1/0448/1895/6449/files/ratof.pdf
    • https://cdn.shopify.com/s/files/1/0433/6553/1806/files/jevesopuganizolijogowiviv.pdf
    • https://cdn.shopify.com/s/files/1/0433/4478/9653/files/biology_10th_class_book.pdf
    • https://cdn.shopify.com/s/files/1/0428/2748/1255/files/vavikabevibonad.pdf
    • https://cdn.shopify.com/s/files/1/0437/4292/0869/files/zomozaramitadiganimed.pdf
    • https://cdn.shopify.com/s/files/1/0436/5818/2809/files/bolt_and_nut_torque_chart.pdf
    • https://cdn.shopify.com/s/files/1/0429/8617/6665/files/josakedajexasawijopof.pdf
    • https://cdn.shopify.com/s/files/1/0432/3403/3824/files/wukovelufuwajuko.pdf
    • https://cdn.shopify.com/s/files/1/0447/7786/5367/files/arduino_ultrasonic_sensor_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0429/1035/1513/files/tenalugokefegaxopa.pdf
    • https://cdn.shopify.com/s/files/1/0428/3544/3875/files/gukipus.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_off0000d7a0.bin
671e3fb7a013dbc1b69d932034b6e1f4bd144d6cdb85ef36a4fdb620c3c63202		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A0 5812 bytes
font_01_sfnt_off0000eb4a.bin
36b0e9fb9ccf998551a571446f8d0ea00efce6e9ded35560a4b989879a0a0152		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4A 14016 bytes

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