Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d2a7efe9454b750…

MALICIOUS

PDF

44.2 KB Created: 2020-08-09 02:14:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c92d81864fac1600661db3684931d251 SHA-1: 063c265b0e2ead6873c604feb76a7ee778f95946 SHA-256: 1d2a7efe9454b75020c2fcbd2338faccc8ea24165bb59366ee5ef3809631fb61
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 indicates that the PDF links to known malicious redirector infrastructure, specifically 'https://ttraff.ru/pify?keyword=laboratory+equipment+and+functions+pdf'. Another heuristic identified a large number of external PDF links, many hosted on cdn.shopify.com, suggesting a link farm or SEO manipulation tactic. The document body contains garbled text but also includes the malicious URL and several other URLs pointing to PDF files, reinforcing the link farm and potential distribution vector.

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=laboratory+equipment+and+functions+pdf
    • http://files.riversideblooms.com/uploads/1/3/1/6/131637014/bf3ce8.pdf
    • http://files.mwri.co/uploads/1/3/2/6/132695694/bavowes_losexet_nijowepotuju.pdf
    • http://files.ponyupponyclub.com/uploads/1/3/0/7/130738534/xokalomanezikiletib.pdf
    • http://files.awardsdayton.com/uploads/1/3/1/4/131453133/40e54.pdf
    • http://najokag.geojeexpatguide.com/uploads/1/3/0/8/130814328/3686599.pdf
    • https://cdn.shopify.com/s/files/1/0430/4293/0842/files/40844766144.pdf
    • https://cdn.shopify.com/s/files/1/0429/3728/6812/files/jurizodivuwexusiwekumuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/1569/1678/files/17758226464.pdf
    • https://cdn.shopify.com/s/files/1/0437/2099/9064/files/52136512104.pdf
    • https://cdn.shopify.com/s/files/1/0430/9522/8565/files/wedusazubomelituk.pdf
    • https://cdn.shopify.com/s/files/1/0429/6422/2101/files/beleb.pdf
    • https://cdn.shopify.com/s/files/1/0433/8280/0542/files/75073533469.pdf
    • https://cdn.shopify.com/s/files/1/0432/1784/6427/files/55220937295.pdf
    • https://cdn.shopify.com/s/files/1/0431/0348/6103/files/450418234.pdf
    • https://cdn.shopify.com/s/files/1/0438/4777/8469/files/download_books_free_online.pdf
    • https://cdn.shopify.com/s/files/1/0431/5542/3383/files/61383432376.pdf
    • https://cdn.shopify.com/s/files/1/0432/7217/5781/files/93045544702.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_off00006e97.bin
5457dd4db656251b868bc9325416344f7b1d73c1b83dd208e3d143fa53a27325		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E97 5576 bytes
font_01_sfnt_off0000817d.bin
bb25901b866fe7483538f8288735f26532896491ff523c06617a9666e68ccb26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x817D 10120 bytes

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