Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4bb33393427c19…

MALICIOUS

PDF

42.1 KB Created: 2020-08-25 09:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f17607321acff52aebcd62394f13aa5d SHA-1: 429c6b40344cb1acfc9060e205a90a4656f61a84 SHA-256: ea4bb33393427c190f0abd7ddf523f5c5eedf108297317565801b58d84e2de52
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL and text suggesting a lure related to a 'risk assessment matrix table template'. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm designed to obscure the ultimate destination. The ML classifier also strongly flagged this PDF as malicious.

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=risk+assessment+matrix+table+template
    • http://files.theadventuresofraz.com/uploads/1/3/2/8/132814427/kaveniz.pdf
    • http://files.atayloredapproach.com/uploads/1/3/1/4/131438111/4256878.pdf
    • http://files.immigrationusalawyer.com/uploads/1/3/0/8/130874253/e75dc61179.pdf
    • http://files.teachershopllc.com/uploads/1/3/1/8/131871704/zenoju-rifaxoteti.pdf
    • http://files.oregonfmc.org/uploads/1/3/2/6/132696598/89fcb176b.pdf
    • https://cdn.shopify.com/s/files/1/0429/8535/7463/files/pamopitojodaluratez.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0835/files/proyecto_de_investigacion_del_bullying_escolar.pdf
    • https://cdn.shopify.com/s/files/1/0435/4729/5898/files/que_color_forma_el_verde_y_amarillo.pdf
    • https://cdn.shopify.com/s/files/1/0429/8234/2815/files/albinismo_tipos.pdf
    • https://cdn.shopify.com/s/files/1/0434/3191/9765/files/7186102226.pdf
    • https://cdn.shopify.com/s/files/1/0429/7677/2250/files/griffiths_introduction_to_electrodynamics_4th_edition_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0429/0707/4723/files/list_of_adjectives_to_describe_a_person.pdf
    • https://cdn.shopify.com/s/files/1/0429/6415/6575/files/nuzenakinazisazudaxew.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23281911610.pdf
    • https://cdn.shopify.com/s/files/1/0429/7264/3491/files/toastmaster_storytelling_manual.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_off0000662a.bin
d85b0c16b876c0cce78df88869579604abe002e3039b31fead6c699e18fd911d
pdf-font-stream PDF embedded font (sfnt) at offset 0x662A 5244 bytes
font_01_sfnt_off000077e5.bin
e1a94a66e1039ec7c7d1881e8e55a1f616c7d4175037a97202b287ea81e8e41c
pdf-font-stream PDF embedded font (sfnt) at offset 0x77E5 10476 bytes