Malicious PDF — malware analysis report

Static analysis result for SHA-256 8996955dbc9d5867…

MALICIOUS

PDF

104.5 KB Created: 2020-08-09 06:39:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa9dea41551d281670fd8f8b4f94d800 SHA-1: db196ec4b900d135c495a8345fe5ba84857d6f7c SHA-256: 8996955dbc9d5867235b1646d95c3e57fa3b2bca625232f77addeff43d6df8ed
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing for a link to known malicious redirector infrastructure at 'https://ttraff.com/pify?keyword=uncle+tom+s+cabin+chapter+1+pdf'. Another critical heuristic indicates a PDF link farm, suggesting an attempt to manipulate search engine results or distribute multiple malicious links. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains text related to 'Uncle Tom's Cabin' and the wkhtmltopdf application, likely serving as a lure.

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/pify?keyword=uncle+tom+s+cabin+chapter+1+pdf
    • http://xavoloril.lebeausejour.ch/uploads/1/3/1/4/131407552/vumosuk.pdf
    • http://files.annualgolf.com/uploads/1/3/1/3/131380288/pidivulan.pdf
    • http://files.eurekasecondaryschool.ie/uploads/1/3/0/8/130874180/4892be4e327.pdf
    • http://files.bethannysbabies.com/uploads/1/3/0/8/130813904/javabifesesizese.pdf
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/81750016880.pdf
    • https://cdn.shopify.com/s/files/1/0432/0670/5316/files/5155194331.pdf
    • https://cdn.shopify.com/s/files/1/0432/4694/4416/files/47764362406.pdf
    • https://cdn.shopify.com/s/files/1/0430/0976/9631/files/woocommerce_load_scripts_to_other_pages.pdf
    • https://cdn.shopify.com/s/files/1/0429/6749/8911/files/sulakakomaj.pdf
    • https://cdn.shopify.com/s/files/1/0440/3865/2069/files/15155181937.pdf
    • https://cdn.shopify.com/s/files/1/0428/9432/7961/files/23251862460.pdf
    • https://cdn.shopify.com/s/files/1/0434/6436/0100/files/3847347457.pdf
    • https://cdn.shopify.com/s/files/1/0432/3413/2131/files/d_d_5e_combat_actions.pdf
    • https://cdn.shopify.com/s/files/1/0431/0820/4701/files/zikuxadulog.pdf
    • https://cdn.shopify.com/s/files/1/0431/2255/7082/files/91847957843.pdf
    • https://cdn.shopify.com/s/files/1/0433/7539/4979/files/42875489323.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_off00015dd9.bin
119b4dfa685e6ef73f65650a699182d33d858bea60e84f7f409a37198f4c1be3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15DD9 5580 bytes
font_01_sfnt_off000170a6.bin
474433137fdec4a604f784ff9eb4f78516a3c73317e8cbf6380324d74117b21e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x170A6 10404 bytes

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