Malicious PDF — malware analysis report

Static analysis result for SHA-256 78e28883d7d7032c…

MALICIOUS

PDF

39.0 KB Created: 2020-08-26 11:49:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d41f0acea7bad22867e8de5d5c26a616 SHA-1: 6a80c837ba328dc8e9eb291cc704e315a4d185aa SHA-256: 78e28883d7d7032c8576a6024477a6aaccf0fa708b94177d076a4ece2060f828
152 Risk Score

Malware Insights

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

The PDF document contains a significant number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be a link farm, potentially used for SEO poisoning or to distribute further malicious content through the identified redirector.

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.cc/pify?keyword=musculos+abductores+del+hombro+pdf
    • http://files.stmatthewsvoorheesville.org/uploads/1/3/1/4/131438899/vufola.pdf
    • http://files.mak-jewelry.com/uploads/1/3/1/1/131164121/7699941.pdf
    • https://cdn.shopify.com/s/files/1/0448/2521/5133/files/cell_biology_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0444/3347/3703/files/dazixivefuzokeboremikar.pdf
    • https://cdn.shopify.com/s/files/1/0436/0385/3469/files/temporary_employment_contract_sample.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nenixuraxolitater.pdf
    • https://cdn.shopify.com/s/files/1/0431/1564/3042/files/67166491650.pdf
    • https://cdn.shopify.com/s/files/1/0431/0935/1585/files/69941781725.pdf
    • https://cdn.shopify.com/s/files/1/0433/9073/0405/files/sapatuwoveg.pdf
    • https://cdn.shopify.com/s/files/1/0431/5385/0528/files/basuxovozamuv.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_off000058f0.bin
663af75a39bbfeff6f2ba253ef8c65930827622aca03bcd5255efbf8b71284ed		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58F0 5540 bytes
font_01_sfnt_off00006ba5.bin
c12ed29f421342fb16284c132959324b7ddee37fd656d236689d7e2731fc6a8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA5 10552 bytes

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