Malicious PDF — malware analysis report

Static analysis result for SHA-256 75dcb27326bbd805…

MALICIOUS

PDF

39.5 KB Created: 2020-08-08 07:07:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e0b79f3334e4154a09ee1b024ca4ced SHA-1: fb615006123f247c76df84c080137de1c246ecdd SHA-256: 75dcb27326bbd805dbd1e41e5d2ddeab80765e339085be20a5d6beace077f619
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one specifically pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body text appears to be mostly garbage data, but the presence of the malicious URL and the sheer volume of links suggest a link farm or redirection scheme designed to lead users to harmful content.

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=separately+excited+dc+motor+pdf
    • http://files.businessbcs.com/uploads/1/3/2/7/132740343/e9c81eaa854.pdf
    • http://rakepuvi.patriciabridewell.com/uploads/1/3/1/1/131164250/vupezaxojux-nosugaxifit-fepufivimag.pdf
    • http://files.mynorthraleightutor.com/uploads/1/3/1/0/131070459/9522092.pdf
    • http://files.perkiblog.com/uploads/1/3/1/0/131071082/nulasipulul-sibexumejoton.pdf
    • http://wujipibo.tlvallewood.com/uploads/1/3/1/6/131637136/9549c6d.pdf
    • https://cdn.shopify.com/s/files/1/0432/5195/7923/files/89825973354.pdf
    • https://cdn.shopify.com/s/files/1/0437/2283/4071/files/breathing_underwater_full_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/career_development_interventions_in_the_21st_century_5th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/4809/2323/files/transformation_of_sentences_affirmative_to_negative_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0432/8115/4198/files/10643317080.pdf
    • https://cdn.shopify.com/s/files/1/0431/1682/2692/files/gravely_zt_42_parts.pdf
    • https://cdn.shopify.com/s/files/1/0430/1979/6643/files/55905119768.pdf
    • https://cdn.shopify.com/s/files/1/0434/3663/8360/files/chaseonline._chase._com_myaccounts._aspx.pdf
    • https://cdn.shopify.com/s/files/1/0432/0228/1633/files/xevafu.pdf
    • https://cdn.shopify.com/s/files/1/0433/6464/7077/files/senodam.pdf
    • https://cdn.shopify.com/s/files/1/0431/7465/8197/files/bodajiru.pdf
    • https://cdn.shopify.com/s/files/1/0432/7473/1685/files/safety_harness_belt.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_off00005bfe.bin
f6210528b845b079cf788585db7c04f2bb7f643d7f6c847c7e7f88ec6e817c72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5BFE 5396 bytes
font_01_sfnt_off00006e55.bin
579b12b9dddca76350f21e73d93cbb0709ae4d6c92d8bef53e6651ae8eb93083		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E55 10236 bytes

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