Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9a3a0788c12d4da…

MALICIOUS

PDF

53.4 KB Created: 2020-08-19 15:24:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec5f7aeaa1566573d0a3e4c910ba6bd8 SHA-1: e870a28baca01c875d7a03b85ce115b9bbc8936d SHA-256: a9a3a0788c12d4daefe2b030bc4b65ad1aa473c9c7314253de9e7c438242f066
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a calendar template. This suggests a phishing or malware delivery attempt. The document body, though heavily obfuscated, contains the same URL and keywords related to calendar templates, reinforcing the lure. The ML classifier strongly flagged this PDF as malicious, and multiple heuristics indicate malicious redirector links and a link farm designed for SEO manipulation.

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=2019+monthly+calendar+template+word+october
    • http://kerarim.carneystudios.net/uploads/1/3/1/6/131606289/debokuxeluf-fowikevu-lotopis.pdf
    • http://fozoda.yellowhouseherbs.com/uploads/1/3/1/3/131379803/delibadegojud_jojase_jogikipizegasar_pavef.pdf
    • http://files.tobymusgrave.com/uploads/1/3/2/6/132682862/87ad321d44.pdf
    • https://cdn.shopify.com/s/files/1/0434/3323/0488/files/45821034644.pdf
    • https://cdn.shopify.com/s/files/1/0430/3300/2145/files/happy_birthday_images_for_brother_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/sokejojoviraxajewezil.pdf
    • https://cdn.shopify.com/s/files/1/0430/6360/7445/files/18634203119.pdf
    • https://cdn.shopify.com/s/files/1/0431/7659/1509/files/baremuxab.pdf
    • https://cdn.shopify.com/s/files/1/0437/6448/2202/files/fagovonalogoxel.pdf
    • https://cdn.shopify.com/s/files/1/0431/3314/1146/files/stardew_valley_time_mod.pdf
    • https://cdn.shopify.com/s/files/1/0436/8865/7049/files/mageredil.pdf
    • https://cdn.shopify.com/s/files/1/0430/8657/7828/files/40957256752.pdf
    • https://cdn.shopify.com/s/files/1/0436/8983/6697/files/22822067390.pdf
    • https://cdn.shopify.com/s/files/1/0428/2191/0694/files/13225560933.pdf
    • https://cdn.shopify.com/s/files/1/0432/0627/9332/files/60530226847.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000083a3.bin
6a4d71ed3540c5eda0dbc0d3147e56a9286a0d0aba03cf028b0afa9765d14314		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83A3 5596 bytes
font_01_sfnt_off0000967b.bin
52738a2b9639dc8556e9c01d9aa24e4a9f0353002df3b1311f765ed7e1124b4b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x967B 10364 bytes
font_02_sfnt_off0000b9fd.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FD 4324 bytes

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