Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5e4657f7458b746…

MALICIOUS

PDF

32.9 KB Created: 2020-08-13 09:04:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dccd73fbbfcdef4187f3a4464c83ccf9 SHA-1: 96f330f7ff7d0d4c55c45cff3d0f8242a4f1ecd4 SHA-256: d5e4657f7458b74640b9215591ca1a77ad49b83936ff3c5d0858116437b0f0f0
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical redirector link pointing to ttraff.ru, which is known malicious infrastructure. The document body, though heavily obfuscated, contains text related to a specific PDF title, suggesting a lure. The ML classifier strongly indicated maliciousness. The primary attack vector appears to be tricking the user into clicking a malicious link disguised as a search result.

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/wb?keyword=clinical%20chemistry%20bishop%208th%20edition%20pdf
    • http://namonewa.doyouhaveitinblack.com/uploads/1/3/0/7/130776407/402db134b.pdf
    • http://files.rhondastruminger.net/uploads/1/3/1/0/131071076/1562942.pdf
    • http://files.janakrauseauthor.com/uploads/1/3/1/0/131070604/6c21ac9f.pdf
    • http://files.motheongprimaryschool.com/uploads/1/3/2/6/132681066/624fe08.pdf
    • https://cdn.shopify.com/s/files/1/0432/1997/6350/files/adjective_or_adverb_exercises_elementary.pdf
    • https://cdn.shopify.com/s/files/1/0432/4353/6541/files/pasavunanaledekowawo.pdf
    • https://cdn.shopify.com/s/files/1/0432/0677/0849/files/tidibapigavegupip.pdf
    • https://cdn.shopify.com/s/files/1/0433/3531/9711/files/47713804773.pdf
    • https://cdn.shopify.com/s/files/1/0432/2846/3271/files/african_music_history.pdf
    • https://cdn.shopify.com/s/files/1/0427/4244/8295/files/directv_vizio_tv_codes.pdf
    • https://cdn.shopify.com/s/files/1/0430/6622/8898/files/tumawuzusinamodu.pdf
    • https://cdn.shopify.com/s/files/1/0435/6666/1800/files/26460719421.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/59854739703.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fuwemosuwizukuxitakalav.pdf
    • https://cdn.shopify.com/s/files/1/0438/9486/6088/files/dinupezesifi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8512/8099/files/dijatebivo.pdf
    • https://cdn.shopify.com/s/files/1/0440/7223/9269/files/14015872818.pdf
    • https://cdn.shopify.com/s/files/1/0437/0271/4536/files/reasoning_ability_notes.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000479c.bin
991157dc05e82f77499ce04adaf9390de68bbe448f1c80149e22709dc96fbc1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x479C 5736 bytes
font_01_sfnt_off00005ad9.bin
702b3f74581b7eafe456af74f89dc047facf5440ac067981444214ff9d264f43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AD9 8072 bytes

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