Malicious PDF — malware analysis report

Static analysis result for SHA-256 4487ef88ee881a5a…

MALICIOUS

PDF

37.4 KB Created: 2020-08-15 06:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e05fecb1166e5fd73cc5ff5291bd43da SHA-1: 2294b0a9ae96c597530c5a7c11765e3af956c162 SHA-256: 4487ef88ee881a5aa1eab269d73ab48e4a864a39c503660578ac4e7bed2fdba2
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though obfuscated, contains the same URL, suggesting it's the primary lure. The PDF also exhibits a link farm behavior, with numerous external links, many hosted on Shopify, potentially to obscure the malicious intent. The ML classifier strongly indicates maliciousness.

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.com/wb?keyword=yashica%20t3%20user%20manual
    • http://gapenep.mikericesports.com/uploads/1/3/1/4/131438684/nuvumigub.pdf
    • http://zimibogi.totemshilohs.com/uploads/1/3/2/6/132681946/divotuxigakab_sivoxawib.pdf
    • http://files.cbmaspeth.com/uploads/1/3/1/0/131070713/topizu.pdf
    • https://cdn.shopify.com/s/files/1/0430/0685/3269/files/7133682682.pdf
    • https://cdn.shopify.com/s/files/1/0434/6544/1430/files/gijugumukamuwekanogole.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/ledoviz.pdf
    • https://cdn.shopify.com/s/files/1/0434/2651/3048/files/bruchrechnen_textaufgaben_mit_lsung.pdf
    • https://cdn.shopify.com/s/files/1/0429/7421/6351/files/academic_reading_test.pdf
    • https://cdn.shopify.com/s/files/1/0429/8860/1503/files/28464238076.pdf
    • https://cdn.shopify.com/s/files/1/0437/6467/8807/files/bidopigufowevokoloxime.pdf
    • https://cdn.shopify.com/s/files/1/0432/1024/4256/files/rugilifavijitiwiwoju.pdf
    • https://cdn.shopify.com/s/files/1/0435/4513/3207/files/benojo.pdf
    • https://cdn.shopify.com/s/files/1/0446/5927/7987/files/personal_hygiene_food_safety.pdf
    • https://cdn.shopify.com/s/files/1/0432/6676/9058/files/lunugetagegiwabubilosi.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_off0000529d.bin
798de4257a5e4bc9c6a7963d0c5691824315bffe6e06b1a2259670e58e750c74
pdf-font-stream PDF embedded font (sfnt) at offset 0x529D 5164 bytes
font_01_sfnt_off000063ff.bin
fde85f9bdbe11b109ffbd765129cf1ba60ce29e4494d34fbf8dff1002dc08712
pdf-font-stream PDF embedded font (sfnt) at offset 0x63FF 10856 bytes