Malicious PDF — malware analysis report

Static analysis result for SHA-256 9833978dd914ca8c…

MALICIOUS

PDF

46.6 KB Created: 2020-08-05 23:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 14ff8dcf654a296ae0446830194739d5 SHA-1: ef50f9f33dc2e8f9c957359ac9aff6330a11fd0a SHA-256: 9833978dd914ca8cbfb91593eb8a13ee36f094450846e7907d3b881930e3cf10
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains multiple embedded URLs, with one identified as a known malicious redirector. The ML classifier also flagged this PDF as malicious. The presence of a link farm suggests an attempt to manipulate search engine results or distribute content broadly. The document body, though heavily obfuscated, contains the redirector URL and several other URLs hosted on Shopify and other domains, indicating a potential distribution or redirection scheme.

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.com/pify?keyword=el+camino+del+artista+julia+pdf
    • http://xisitefi.paintingoz.com/uploads/1/3/1/6/131606407/27de35438f6e6c7.pdf
    • http://files.emas-usa.com/uploads/1/3/2/8/132814463/ligow.pdf
    • http://files.milanarielleproductions.com/uploads/1/3/0/7/130739505/nosaletogaw.pdf
    • http://ripipito.columbuscorvetteclub.com/uploads/1/3/0/7/130739678/0af8e3d.pdf
    • https://cdn.shopify.com/s/files/1/0433/3010/9593/files/vukakobosagemomivolaju.pdf
    • https://cdn.shopify.com/s/files/1/0430/5689/0013/files/subog.pdf
    • https://cdn.shopify.com/s/files/1/0436/6221/3273/files/88829773289.pdf
    • https://cdn.shopify.com/s/files/1/0433/9544/8997/files/43665288796.pdf
    • https://cdn.shopify.com/s/files/1/0433/8493/0462/files/29079445176.pdf
    • https://cdn.shopify.com/s/files/1/0429/1035/1513/files/jabaxowa.pdf
    • https://cdn.shopify.com/s/files/1/0434/9784/8996/files/mulataraja.pdf
    • https://cdn.shopify.com/s/files/1/0430/3316/5986/files/palonakotipadeziw.pdf
    • https://cdn.shopify.com/s/files/1/0434/5528/3367/files/26479991209.pdf
    • https://cdn.shopify.com/s/files/1/0428/6559/0438/files/star_wars_battlefront_2_cheats_ps2.pdf
    • https://cdn.shopify.com/s/files/1/0440/5942/6968/files/40346416214.pdf
    • https://cdn.shopify.com/s/files/1/0436/6041/1033/files/velamanunap.pdf
    • https://cdn.shopify.com/s/files/1/0431/3782/6973/files/16083749134.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_off000073f1.bin
18af18f86268220f40cdc0cd3d40d95ef6d4d8ddc5f09d87f9a78a02102cb014
pdf-font-stream PDF embedded font (sfnt) at offset 0x73F1 5336 bytes
font_01_sfnt_off00008606.bin
f6c1ce79ccfc7f0e70f40369c019d4afa957ae410fa3f00e3423646d4ab5aa9f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8606 11664 bytes