Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a2259ff7f4da0c0…

MALICIOUS

PDF

41.1 KB Created: 2020-08-08 00:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 18c9f209c4fd7fff96ab1f2aa82a218c SHA-1: 3abf5aba132b950a4320b95832c6dc73e7887d56 SHA-256: 2a2259ff7f4da0c0e448caf2a96a5fbd22b14e580a65e86e880f257b8aecd195
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains numerous embedded links. One of these links, https://ttraff.ru/pify?keyword=character+traits+pdf+graphic+organizer, points to a known malicious redirector. The presence of a link farm suggests an attempt to distribute malicious content or phish users. No scripts were extracted from this sample.

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=character+traits+pdf+graphic+organizer
    • http://files.wvdeca.org/uploads/1/3/1/3/131382673/1428882.pdf
    • http://files.midwestwomenssailing.org/uploads/1/3/1/8/131871494/3451219.pdf
    • http://files.sara-thompson-metalsmith.com/uploads/1/3/1/4/131437276/widegigerejoxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2157/4049/files/52349613410.pdf
    • https://cdn.shopify.com/s/files/1/0438/4695/9261/files/selodoladuxil.pdf
    • https://cdn.shopify.com/s/files/1/0430/0757/4179/files/13003661456.pdf
    • https://cdn.shopify.com/s/files/1/0433/9603/8812/files/60366632262.pdf
    • https://cdn.shopify.com/s/files/1/0430/8900/2653/files/poterutubezeponuxagukizak.pdf
    • https://cdn.shopify.com/s/files/1/0429/1022/0447/files/air_brake_test_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0429/8234/2815/files/cannonball_adderley_omnibook.pdf
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/5221092596.pdf
    • https://cdn.shopify.com/s/files/1/0435/1403/6376/files/89794406319.pdf
    • https://cdn.shopify.com/s/files/1/0428/9291/8937/files/jegozebexewefovisapevebeg.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/missouri_state_abbreviation.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_off0000636a.bin
dbeffafc902eaab388a4364d6bb2aa5c3fd2699718d0d331db50b5899a01bf07
pdf-font-stream PDF embedded font (sfnt) at offset 0x636A 5340 bytes
font_01_sfnt_off00007597.bin
e970500f9c97e5c8b6a16c05e96d7bb651b6e865a4a317d0b9481b83b1eb1572
pdf-font-stream PDF embedded font (sfnt) at offset 0x7597 10020 bytes