Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f134b8ef588bbb…

MALICIOUS

PDF

44.8 KB Created: 2020-08-18 14:23:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1784aee434b2869082137d5703c7316 SHA-1: 782266ef96576969ecbfb7d5d56200e4ed6fce4f SHA-256: 55f134b8ef588bbbc6e848a7410805623c9267fab91938c44c626a2dab542c10
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one pointing to a known malicious redirector at `ttraff.ru`. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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=berserk+manga+volume+11
    • http://files.yestoyouthgala.org/uploads/1/3/0/8/130814717/9439970.pdf
    • http://files.coastalkayakcharters.com/uploads/1/3/1/4/131453022/e150e.pdf
    • http://files.livinggodsmission.com/uploads/1/3/0/8/130874413/femobupowufebekoluta.pdf
    • http://files.cotcbos.org/uploads/1/3/1/3/131398088/bubamepipatavosaku.pdf
    • http://files.jokerjitsu13.com/uploads/1/3/1/0/131070452/0b0a5071d20.pdf
    • https://cdn.shopify.com/s/files/1/0431/6908/7642/files/android_google_analytics_event.pdf
    • https://cdn.shopify.com/s/files/1/0438/6154/1014/files/formal_letter_writing_topics_grade_10.pdf
    • https://cdn.shopify.com/s/files/1/0433/5838/8374/files/free_camisole_pattern.pdf
    • https://cdn.shopify.com/s/files/1/0431/5653/7493/files/bixewurogimudi.pdf
    • https://cdn.shopify.com/s/files/1/0435/0692/5720/files/tatsuro_yamashita_sparkle_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xutowoterefabobenovise.pdf
    • https://cdn.shopify.com/s/files/1/0430/3116/7137/files/86487281380.pdf
    • https://cdn.shopify.com/s/files/1/0431/8596/3168/files/napco_1632_programming_manual.pdf
    • https://cdn.shopify.com/s/files/1/0443/1475/5228/files/satyanarayana_biochemistry_latest_edition.pdf
    • https://cdn.shopify.com/s/files/1/0432/4874/6651/files/topexedosifufomuwebokus.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_off000065f9.bin
8ca7d4b2a8fd9af03c203b7dee62462bdf08ffa5de8d87f2bb781cf2dbcb09a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F9 4984 bytes
font_01_sfnt_off000076d9.bin
2478fbe2f8938e877ee2b707f5c59adb75e4bdc4965827b640d6b4d17264947e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x76D9 9812 bytes
font_02_sfnt_off00009877.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9877 4324 bytes

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