Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7722e32558e045b…

MALICIOUS

PDF

40.4 KB Created: 2020-08-20 09:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09ec4bbd53df0216fb03f659922d0d2b SHA-1: dca445ad5767eb30321d7fe198ccb1f207c65a24 SHA-256: e7722e32558e045b0711be18fadb488ff815cc74a398e91ed2f8e130444bdf6f
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector. One of the primary links, 'https://ttraff.ru/pify?keyword=choose+verb+3rd+form', is flagged as malicious. The document body, though heavily obfuscated, also contains this URL. The presence of a large number of external links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly indicated 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.ru/pify?keyword=choose+verb+3rd+form
    • http://tosobapef.the-freelance-artists.com/uploads/1/3/2/6/132696141/mebozaxixibu_vigigab.pdf
    • http://files.polarpearlscanada.ca/uploads/1/3/1/6/131637362/xatamifopilasi.pdf
    • https://cdn.shopify.com/s/files/1/0437/8470/0055/files/23744346364.pdf
    • https://cdn.shopify.com/s/files/1/0428/8082/7558/files/38399284599.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3270/files/delisojodu.pdf
    • https://cdn.shopify.com/s/files/1/0432/1512/6685/files/national_lottery_syndicate_agreement_form.pdf
    • https://cdn.shopify.com/s/files/1/0433/8191/5802/files/how_to_initialize_a_git_repository.pdf
    • https://cdn.shopify.com/s/files/1/0428/6713/0534/files/atlas_shrugged_cliff_notes.pdf
    • https://cdn.shopify.com/s/files/1/0430/4722/3458/files/42277793041.pdf
    • https://cdn.shopify.com/s/files/1/0441/1277/3272/files/1039845805.pdf
    • https://cdn.shopify.com/s/files/1/0428/9029/7507/files/wamonudiwuxigimexekoza.pdf
    • https://cdn.shopify.com/s/files/1/0450/3647/0430/files/std_string_formatting.pdf
    • https://cdn.shopify.com/s/files/1/0437/2099/9064/files/science_crossword_puzzles.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/
    • https://cdn.shopify.com/s/files/1/0428/6713/0534/files/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005367.bin
4ac3427572663638c43a02195ca46b00093f4541595aaecb82b882c86f13362c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5367 4848 bytes
font_01_sfnt_off000063df.bin
1af6780f38bbfc568f2ee23f5da0ba1ffeaf04bae2c8d39b4b3782933110762c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63DF 10060 bytes
font_02_sfnt_off00008655.bin
ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8655 4324 bytes

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