Malicious PDF — malware analysis report

Static analysis result for SHA-256 21fa898c9c9618cf…

MALICIOUS

PDF

40.3 KB Created: 2020-08-27 21:17:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: deafda4f76c944931dfcae810f2f3ce5 SHA-1: c1fa305cc97e46238401db6f3fcd419544cd7de9 SHA-256: 21fa898c9c9618cfd30222c1e6ad61db637abd5d3aa881a0db9d3e0de17db7e6
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a dog care pamphlet. The document also exhibits characteristics of a link farm, with numerous embedded links to external PDFs, many hosted on cdn.shopify.com. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed to lure users to malicious infrastructure.

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=dog+care+merit+badge+pamphlet
    • http://files.noodlestales.com/uploads/1/3/1/6/131636891/tefelizizisi-sujotisoti.pdf
    • http://files.neussephotography.com/uploads/1/3/2/8/132814544/fotimalesizamej_deparadesejek_ginemukub.pdf
    • http://files.drivingfordeclan.com/uploads/1/3/1/6/131606733/a5645474.pdf
    • http://dawigo.justinedaisuke.com/uploads/1/3/2/6/132695780/2b81ae5d.pdf
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/baud_rate_generator.pdf
    • https://cdn.shopify.com/s/files/1/0432/0568/9504/files/giniwiborobekelukedigef.pdf
    • https://cdn.shopify.com/s/files/1/0438/3614/5814/files/32692110184.pdf
    • https://cdn.shopify.com/s/files/1/0432/0968/7208/files/bevujagife.pdf
    • https://cdn.shopify.com/s/files/1/0438/2133/4690/files/biogeography_an_ecological_and_evolutionary_approach_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/0638/6595/files/shinjuku_station_map.pdf
    • https://cdn.shopify.com/s/files/1/0460/0001/3479/files/amenerrasul_arapa.pdf
    • https://cdn.shopify.com/s/files/1/0459/9100/2279/files/babul_movie_full_hd_video_song.pdf
    • https://cdn.shopify.com/s/files/1/0432/6155/8944/files/41820379809.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_off00005f85.bin
effc06ffe873de8c37fb11b7497b4cfbc7aacfdc153bc533f90eaf85cfbdc7e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F85 5448 bytes
font_01_sfnt_off000071de.bin
f3b7695d979f44271b772ee91d56f814c2d1abbc718271e13be4bfb1a88cdc20
pdf-font-stream PDF embedded font (sfnt) at offset 0x71DE 10076 bytes