Malicious PDF — malware analysis report

Static analysis result for SHA-256 62e4d8076826cd24…

MALICIOUS

PDF

56.5 KB Created: 2020-08-05 00:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 933907468de4d892db44cfa42afc09b9 SHA-1: da9447a6324e4a12e8866e05901c3550a9de31df SHA-256: 62e4d8076826cd245ee42e6b7227f76410352ecbdd5dd45b8598d647cbe690b4
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to what appears to be a link farm designed to generate SEO traffic. One prominent URL, https://ttraff.ru/pify?keyword=yield+management+strategies+for+the+service+industries+pdf, is flagged as a malicious redirector. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to direct users to malicious infrastructure under the guise of providing academic resources.

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.ru/pify?keyword=yield+management+strategies+for+the+service+industries+pdf
    • http://files.jiffyouth.org/uploads/1/3/1/3/131381900/7d3da6.pdf
    • http://files.bellehendrik.com/uploads/1/3/1/0/131070452/sunezeme_tazewo.pdf
    • http://files.annetrauben.com/uploads/1/3/1/6/131637125/divaputuxip.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5819/1768/files/carbohydrates_classification.pdf
    • https://cdn.shopify.com/s/files/1/0431/1285/7754/files/virtual_earth_worm_dissection.pdf
    • https://cdn.shopify.com/s/files/1/0435/3042/0384/files/14955229343.pdf
    • https://cdn.shopify.com/s/files/1/0432/3059/3192/files/20030419293.pdf
    • https://cdn.shopify.com/s/files/1/0430/2995/4721/files/resident_evil_hd_remaster_walkthrough.pdf
    • https://cdn.shopify.com/s/files/1/0430/1206/3391/files/xuwaguzanalamomawu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8274/files/88910660432.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/22511335110.pdf
    • https://cdn.shopify.com/s/files/1/0428/3708/2271/files/3833174867.pdf
    • https://cdn.shopify.com/s/files/1/0430/4489/6925/files/62513010717.pdf
    • https://cdn.shopify.com/s/files/1/0432/4301/2256/files/ahlam_mosteghanemi_memory_in_the_flesh.pdf
    • https://cdn.shopify.com/s/files/1/0430/8933/0330/files/dogixikoladomutimomaken.pdf
    • https://cdn.shopify.com/s/files/1/0434/7432/1560/files/95276320862.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_off00009e50.bin
5b07cbe2ebbcd36a1b7a2a4fa88fa5da58373a805b7376185c30047253c1e39e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E50 5592 bytes
font_01_sfnt_off0000b136.bin
02cf80a20580ed713efc241b4a0881b1f43e0a3acd7b88452307b1f3c7fbde70		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB136 10312 bytes

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