Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e91113fd5b78500…

MALICIOUS

PDF

50.5 KB Created: 2020-08-06 16:51:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c1b57afc407b46b7827e1a1b8ecee892 SHA-1: b0ba9da3fccb386ff1ba0ac15daba745ac765d90 SHA-256: 6e91113fd5b78500d8dcf7646736da493383f7cb9a466c74f0a4216b8ea20800
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 the URL https://ttraff.ru/pify?keyword=all+rules+of+articles+in+english+grammar+pdf. The document body, though heavily obfuscated, contains this URL and appears to be a lure for a PDF related to English grammar. The ML classifier also strongly flagged this PDF as malicious.

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=all+rules+of+articles+in+english+grammar+pdf
    • http://files.towsondancestudio.com/uploads/1/3/1/4/131437779/7443026.pdf
    • http://files.adara-spa.com/uploads/1/3/0/8/130874347/ximuxozewiluxofewate.pdf
    • http://files.firstunitedlf.org/uploads/1/3/0/7/130738548/wobikid.pdf
    • http://files.moonmeart.com/uploads/1/3/1/3/131381471/jirib_zawuw_mememesotevuvew_luvodosuxiruv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0429/7120/1695/files/78517261571.pdf
    • https://cdn.shopify.com/s/files/1/0435/4942/5823/files/bharata_muni_natyashastra_rasa_theory.pdf
    • https://cdn.shopify.com/s/files/1/0438/5167/7856/files/2606284759.pdf
    • https://cdn.shopify.com/s/files/1/0437/6176/2456/files/3348524168.pdf
    • https://cdn.shopify.com/s/files/1/0427/8494/8380/files/asme_y14_5_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/0944/1953/files/raxuf.pdf
    • https://cdn.shopify.com/s/files/1/0428/9436/0743/files/mutemusimujuzuxapanelaxod.pdf
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/66322933355.pdf
    • https://cdn.shopify.com/s/files/1/0433/8706/0378/files/ethical_principles_in_medicine.pdf
    • https://cdn.shopify.com/s/files/1/0433/4111/9653/files/fiba_basketball_rules_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/7334/6465/files/tujewiva.pdf
    • https://cdn.shopify.com/s/files/1/0438/8637/9160/files/32309611530.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/jisabisagubimebusogapasof.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000794b.bin
4dfdaac1662ddf2017a2680ff7e85b6ef4ddec90a9ed0e2b44f1577a7cde17f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x794B 5440 bytes
font_01_sfnt_off00008b95.bin
34f8f8875d51cde194b8d8d5b5a386094c25cec0c861b55f2f46e46847235925		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B95 10236 bytes
font_02_sfnt_off0000ae74.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE74 4324 bytes

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