Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0bf708f5763bdfa…

MALICIOUS

PDF

42.0 KB Created: 2020-08-04 11:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0aad43c248435c550a7a01ba8c7448f6 SHA-1: 9b0d8eb9a5767a364a75e0021f487e0b295970a4 SHA-256: d0bf708f5763bdfa01043921a365d303e93ed1ca9d9a1ea4f11182fe3ee7ee59
152 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one critical heuristic firing indicating a redirect to known malicious infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The ML classifier also strongly indicated maliciousness. The primary attack vector is a user being tricked into clicking a link within the PDF.

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=molecular+gastronomy+books+pdf
    • http://files.joshreynoldsyeo.com/uploads/1/3/1/3/131383541/tokalewutexatad_loxekusak_dafojuwejesunep.pdf
    • http://files.longbeachjunkremoval.org/uploads/1/3/0/7/130740504/751102.pdf
    • http://files.sandaharrboerboels.com/uploads/1/3/2/6/132681566/6896535.pdf
    • https://cdn.shopify.com/s/files/1/0438/8922/9979/files/sazuz.pdf
    • https://cdn.shopify.com/s/files/1/0431/7754/1787/files/rinupotisedovixunulobe.pdf
    • https://cdn.shopify.com/s/files/1/0429/9961/1553/files/gemeparuxogaxurudul.pdf
    • https://cdn.shopify.com/s/files/1/0428/3406/7615/files/dojeribivotofa.pdf
    • https://cdn.shopify.com/s/files/1/0432/9455/6320/files/laxexafomijoxetunewiliziz.pdf
    • https://cdn.shopify.com/s/files/1/0433/3171/5225/files/92926778359.pdf
    • https://cdn.shopify.com/s/files/1/0433/0445/2246/files/bijutawigavabugus.pdf
    • https://cdn.shopify.com/s/files/1/0435/5388/2280/files/patufidigox.pdf
    • https://cdn.shopify.com/s/files/1/0436/9947/0486/files/alphabetize_in_google_sheets.pdf
    • https://cdn.shopify.com/s/files/1/0430/8451/3440/files/51372943646.pdf
    • https://cdn.shopify.com/s/files/1/0436/3013/3406/files/fukegamusugano.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_off0000644e.bin
36591fd3a0c19393b6b29884888b3005cce9b0d54e99e96fb4590dea20179b33
pdf-font-stream PDF embedded font (sfnt) at offset 0x644E 5784 bytes
font_01_sfnt_off00007800.bin
e76d06fbdc433fcd5a68fa3d7a6e473bee24e16d6a4fe826bd434c7b7a7de1ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x7800 10196 bytes