Malicious PDF — malware analysis report

Static analysis result for SHA-256 346a680310dabf05…

MALICIOUS

PDF

41.8 KB Created: 2020-08-21 21:46:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1644bb3a3a1ca386bef511e639ed7b37 SHA-1: 8dfce9d3c493f122ee02becea7a6691e7f6c4bf4 SHA-256: 346a680310dabf057be63a13298370ef24bea741eb0abd8c8cebcc6194da4673
152 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded links, with one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting a tactic to manipulate search engine results or distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the primary attack vector appears to be the malicious redirection and link farm.

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.cc/pify?keyword=blank+weekly+calendar+template+word
    • http://keweduv.lindenhillspottery.com/uploads/1/3/1/4/131437462/8045141.pdf
    • http://vukamerep.melaniekolbe.com/uploads/1/3/2/7/132712615/4847386.pdf
    • http://files.allisonroseentertainment.com/uploads/1/3/0/8/130874329/6494983ab5ec.pdf
    • https://cdn.shopify.com/s/files/1/0432/2902/0317/files/67242312742.pdf
    • https://cdn.shopify.com/s/files/1/0437/8561/7570/files/eso_tribunal_preacher.pdf
    • https://cdn.shopify.com/s/files/1/0434/4430/6086/files/32243302833.pdf
    • https://cdn.shopify.com/s/files/1/0438/8945/9368/files/assamese_hori_nam_2019.pdf
    • https://cdn.shopify.com/s/files/1/0431/2272/0922/files/boot_camp_workout_videos.pdf
    • https://cdn.shopify.com/s/files/1/0438/6455/5680/files/english_tutorials_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0434/1936/9639/files/73160872957.pdf
    • https://cdn.shopify.com/s/files/1/0437/3600/6817/files/wigavajolonusatugazag.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_off0000665b.bin
ad8e3c9c1b4f36fdc2fc3e8b48f51b1244d411e6bb859d704859273144ed11e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x665B 5348 bytes
font_01_sfnt_off0000788a.bin
d68813b6f072e57feaa8fc6f830342a0b0e5db202b62b25e4e991a4feb045ea5
pdf-font-stream PDF embedded font (sfnt) at offset 0x788A 9980 bytes