Malicious PDF — malware analysis report

Static analysis result for SHA-256 51406aee10848d75…

MALICIOUS

PDF

39.6 KB Created: 2020-08-15 04:40:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa559eebbc4b13d08df0d1a06d7ca970 SHA-1: 030d242182efac8865760217baf36d2a424a1de4 SHA-256: 51406aee10848d75f8e509a0b20cc23b54cc36259fbaef329054ee9bb977ed55
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure, while another noted a large number of external PDF links, suggesting a link farm or SEO manipulation tactic. The document body contains garbled text and embedded URLs, further supporting the malicious nature of the file.

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=music+concert+poster+design+template+free
    • http://files.lindalgraham.com/uploads/1/3/0/7/130739004/pixarokodawin_megom_kezideve_wegelasulo.pdf
    • http://files.metis8.com/uploads/1/3/0/8/130814475/ab5bcdc2724.pdf
    • https://cdn.shopify.com/s/files/1/0434/7101/2006/files/the_black_ghosts_full_moon.pdf
    • https://cdn.shopify.com/s/files/1/0430/1311/1961/files/pobuvam.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/niv_audio_bible_old_testament.pdf
    • https://cdn.shopify.com/s/files/1/0437/5108/0090/files/73727243270.pdf
    • https://cdn.shopify.com/s/files/1/0439/1678/7880/files/tuveparagumowefiwupopu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3618/0634/files/80491927165.pdf
    • https://cdn.shopify.com/s/files/1/0431/6934/9794/files/77732170932.pdf
    • https://cdn.shopify.com/s/files/1/0430/7494/5184/files/belesenaxumurazutigev.pdf
    • https://cdn.shopify.com/s/files/1/0447/8281/3341/files/add_and_subtract_fractions_with_unlike_denominators.pdf
    • https://cdn.shopify.com/s/files/1/0433/8135/8753/files/vunosogitexewigodadi.pdf
    • https://cdn.shopify.com/s/files/1/0432/8131/8056/files/advaita_bodha_deepika_portugues.pdf
    • https://cdn.shopify.com/s/files/1/0436/6221/3273/files/nick_pivetta_fangraphs.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_off00005e37.bin
0df99aa36403a910e4ed5154039a273034da38049f71b8fb9fbde17f9af632ef
pdf-font-stream PDF embedded font (sfnt) at offset 0x5E37 5480 bytes
font_01_sfnt_off000070c7.bin
d8cb6f26c5458b31ae2bc87eb5503874371828280f2e69047464fbd5d44e5a6d
pdf-font-stream PDF embedded font (sfnt) at offset 0x70C7 9716 bytes