Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f42709c8a7ba26b…

MALICIOUS

PDF

118.5 KB Created: 2020-08-04 13:22:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b6f35cad279d71d96fedfc23fc4c3e0e SHA-1: 74b144d4d1bf29210cf712771d5d970ffeaf9cbf SHA-256: 6f42709c8a7ba26b93c7e0d5125463673375355482bb366e0dc79b49b30e9bf9
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL. The presence of numerous other PDF links, many hosted on Shopify, suggests a link farm designed to obscure the ultimate destination. The ML classifier also strongly indicated maliciousness.

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=roger+olson+contra+o+calvinismo+pdf
    • http://files.garyfrymusic.com/uploads/1/3/0/7/130776104/784af233.pdf
    • http://files.red-bean-coffee.com/uploads/1/3/0/8/130814124/3988868.pdf
    • http://files.slowerlowerdelaware.com/uploads/1/3/0/9/130969404/dasifupibub-vegajojenurut.pdf
    • http://files.heroinanonymous585.org/uploads/1/3/0/8/130874432/2097768.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23342697578.pdf
    • https://cdn.shopify.com/s/files/1/0431/2439/2087/files/microelectronic_circuits_6th_edition_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/xaraxotogifula.pdf
    • https://cdn.shopify.com/s/files/1/0434/7982/6597/files/fadagekizujirejonazebutof.pdf
    • https://cdn.shopify.com/s/files/1/0431/6450/0122/files/51105253332.pdf
    • https://cdn.shopify.com/s/files/1/0435/3854/6840/files/zilexuvujujimixabofe.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/rinajimakonewob.pdf
    • https://cdn.shopify.com/s/files/1/0431/9690/7678/files/xexegu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2770/1655/files/70920001738.pdf
    • https://cdn.shopify.com/s/files/1/0432/8266/1526/files/2056798034.pdf
    • https://cdn.shopify.com/s/files/1/0428/9898/1030/files/jimej.pdf
    • https://cdn.shopify.com/s/files/1/0432/1063/7475/files/mirogu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0101/1614/files/24418797365.pdf
    • https://cdn.shopify.com/s/files/1/0431/6623/6826/files/70789622270.pdf
    • https://cdn.shopify.com/s/files/1/0437/0654/8377/files/5216321536.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_off000195c3.bin
55f5bdffcc27e0009d16892375e5f6b10c2c00550f68194cc97c2c91eca96120		 pdf-font-stream PDF embedded font (sfnt) at offset 0x195C3 5540 bytes
font_01_sfnt_off0001a89c.bin
6ff579ec92b3b6e6e74923560b45ba8981c8e865667e24c79ce5730cacd6f4d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A89C 10220 bytes

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