Malicious PDF — malware analysis report

Static analysis result for SHA-256 da1ae1cadfc4ef55…

MALICIOUS

PDF

56.1 KB Created: 2020-07-29 17:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c55b6e05f3d7983e001b722fdf09a896 SHA-1: ae363fb67294db005b2cd78fc58f3d3eba077a99 SHA-256: da1ae1cadfc4ef557bcf5b83248570dce388b37c124de482816c287537dd10d4
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and heuristics indicate it contains a malicious redirector link and a large number of external links, suggesting a link farm or SEO manipulation tactic. The primary malicious URL identified is ttraff.ru, which is known for redirecting to malicious content. While the document body is heavily obfuscated, the presence of numerous links points towards a delivery mechanism rather than direct content exploitation.

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=einstein+on+the+beach+score+pdf
    • http://files.thecuriousunicorn.com/uploads/1/3/1/8/131871556/bilefonamupipaw_liniva_naboroj_mutibonumaxaxu.pdf
    • http://files.lachongsd.org/uploads/1/3/0/7/130775848/3342574.pdf
    • http://files.amsphotographyllc.net/uploads/1/3/1/3/131384589/5c1d0dc0edb474.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23929268289.pdf
    • https://cdn.shopify.com/s/files/1/0433/7182/3262/files/dogagosaxuwuwekexe.pdf
    • https://cdn.shopify.com/s/files/1/0437/7765/4942/files/94983193109.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/16946396068.pdf
    • https://cdn.shopify.com/s/files/1/0427/7505/2454/files/juxotalativasokokug.pdf
    • https://cdn.shopify.com/s/files/1/0434/7982/6584/files/98322189471.pdf
    • https://cdn.shopify.com/s/files/1/0433/8450/4474/files/89230050964.pdf
    • https://cdn.shopify.com/s/files/1/0430/5816/7959/files/numetodesenaveraxosad.pdf
    • https://cdn.shopify.com/s/files/1/0429/7588/7523/files/49782607555.pdf
    • https://cdn.shopify.com/s/files/1/0429/8987/9445/files/49808152266.pdf
    • https://cdn.shopify.com/s/files/1/0429/4311/9527/files/widapokarateli.pdf
    • https://cdn.shopify.com/s/files/1/0440/5932/8662/files/92040288954.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rumifagekesodurelakalon.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_off00009ee9.bin
ed1b41770a5fb0584d5b009c53577a1459da61114aca62e0d2bbfaee9df14b4a
pdf-font-stream PDF embedded font (sfnt) at offset 0x9EE9 5096 bytes
font_01_sfnt_off0000b022.bin
09f0b677036cdd834a4880abe7d9c59a7e2d51e26e9a399474cbc3ce9fb07094
pdf-font-stream PDF embedded font (sfnt) at offset 0xB022 10192 bytes