Malicious PDF — malware analysis report

Static analysis result for SHA-256 24f8d7cc86a49f7f…

MALICIOUS

PDF

40.0 KB Created: 2020-08-24 00:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fadaf8bd733fd0c2bb91251ec9af1752 SHA-1: 122b688b045594994a816fb398998c88547d7d1d SHA-256: 24f8d7cc86a49f7f1c612cfdc6fe453b73b1f07149b1898f4fd084f4c84011a3
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body text, though partially corrupted, includes the phrase 'Free 2020 yearly calendar template' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves redirecting users to malicious sites via embedded links.

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=free+2020+yearly+calendar+template
    • http://nuxotote.stephenlemons76.com/uploads/1/3/0/9/130969744/8231981.pdf
    • http://gebefe.scorrybreac.org/uploads/1/3/0/8/130813694/61e005ba51741.pdf
    • http://mepev.rhythms-of-grace.org/uploads/1/3/0/8/130873987/4594504.pdf
    • https://cdn.shopify.com/s/files/1/0427/5470/3526/files/nokuma.pdf
    • https://cdn.shopify.com/s/files/1/0462/3145/3847/files/discourse_analysis_journal_articles.pdf
    • https://cdn.shopify.com/s/files/1/0432/3010/1668/files/sql_format_amount_with_commas.pdf
    • https://cdn.shopify.com/s/files/1/0437/0661/3912/files/xejan.pdf
    • https://cdn.shopify.com/s/files/1/0435/9615/2995/files/jefipezel.pdf
    • https://cdn.shopify.com/s/files/1/0433/4652/6376/files/golax.pdf
    • https://cdn.shopify.com/s/files/1/0429/6785/9359/files/sewing_machine_parts_crossword_puzzle_answers.pdf
    • https://cdn.shopify.com/s/files/1/0449/6493/7896/files/ff14_trigonometry_guide.pdf
    • https://cdn.shopify.com/s/files/1/0430/6288/6549/files/xuronenuja.pdf
    • https://cdn.shopify.com/s/files/1/0434/1006/3527/files/65025366238.pdf
    • https://cdn.shopify.com/s/files/1/0438/7844/9307/files/lofakub.pdf
    • https://cdn.shopify.com/s/files/1/0433/7673/8462/files/21892681628.pdf
    • https://cdn.shopify.com/s/files/1/0430/6049/4490/files/22576850271.pdf
    • https://cdn.shopify.com/s/files/1/0432/4396/2532/files/how_to_make_a_metal_bending_machine.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_off00005e14.bin
88fe17699fd63dacef8a91610db8daabd9f7a15288c085a5618373c7d9f05da1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E14 5372 bytes
font_01_sfnt_off0000704a.bin
7042258c74d9b3d6726704b01056cf8a36ad1a29c1adf596d4405d5bfc919a74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x704A 10172 bytes

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