Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f59275d0ab2faac…

MALICIOUS

PDF

33.4 KB Created: 2020-08-11 08:28:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e14cf65d0c5ecd7e74935e3a64b70a31 SHA-1: 62d3e95cd1cfe700450f27fec00f7ecf0c9c540c SHA-256: 6f59275d0ab2faac226314c1f0b509dfd28b11588db9df9d6e58ed32caa873f6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a redirector service, which is a common tactic for distributing malware or phishing pages. The document body, though heavily obfuscated, contains text suggesting a lure for a physics textbook PDF, which is then linked to a malicious URL. The presence of numerous external PDF links further supports a link farm or redirection scheme.

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=a+level+physics+textbook+pdf+edexcel
    • http://files.kerrigoodman.com/uploads/1/3/1/4/131437822/3272253.pdf
    • http://files.unfeatheredink.com/uploads/1/3/1/0/131070317/2654769.pdf
    • http://files.tsipros.us/uploads/1/3/0/7/130776162/8894817.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/8638/8136/files/40897606189.pdf
    • https://cdn.shopify.com/s/files/1/0432/1309/5067/files/mechanism_of_muscle_contraction_sliding_filament_theory.pdf
    • https://cdn.shopify.com/s/files/1/0437/6051/7271/files/laporan_keuangan_astra_international_2020.pdf
    • https://cdn.shopify.com/s/files/1/0435/2396/5079/files/68045171081.pdf
    • https://cdn.shopify.com/s/files/1/0432/7152/0414/files/hack_clicker_heroes.pdf
    • https://cdn.shopify.com/s/files/1/0437/4845/8647/files/awk_command_in_unix.pdf
    • https://cdn.shopify.com/s/files/1/0435/0102/7493/files/da_4856.pdf
    • https://cdn.shopify.com/s/files/1/0427/5752/1574/files/40415274911.pdf
    • https://cdn.shopify.com/s/files/1/0429/2621/1238/files/alone_together_piano.pdf
    • https://cdn.shopify.com/s/files/1/0432/8495/5300/files/zifinevovatusufuvetas.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/cancer_de_cuello_uterino_peru.pdf
    • https://cdn.shopify.com/s/files/1/0428/6421/4182/files/pathophysiology_of_acute_gastroenteritis.pdf
    • https://cdn.shopify.com/s/files/1/0431/5657/0266/files/dajoruz.pdf
    • https://cdn.shopify.com/s/files/1/0437/3485/9941/files/tafegujofafukera.pdf
    • https://cdn.shopify.com/s/files/1/0437/1818/1013/files/54707008162.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_off0000467f.bin
6a7d6210db11a88fa0272fde5e9399c9f0be0e75c5a2595c61b66955a8710870		 pdf-font-stream PDF embedded font (sfnt) at offset 0x467F 5360 bytes
font_01_sfnt_off000058bf.bin
0bf69eadfb270495641393b0fe1081e3a987844e30cc9f430b42d0cc5b57f2cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58BF 9332 bytes

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