Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef10892343bd78e4…

MALICIOUS

PDF

37.9 KB Created: 2020-08-19 00:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 139b6852671ab2363f980d239cf06f67 SHA-1: cd1ac27296e43412a245a13bb90b629087733e28 SHA-256: ef10892343bd78e4ac72295ee50fb343c8ce595e6fa11e9aa1ce1b3e8cadd222
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'. Additionally, it features a PDF link farm heuristic, indicating a large number of external links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The primary attack vector appears to be luring the user to click the malicious link within the document.

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=brand+banjo+new+song
    • http://durageduj.camsonelectric.com/uploads/1/3/1/4/131412032/rexudur_xewomobuvolem_jujefapu.pdf
    • http://jolidema.tiffanytucker.us/uploads/1/3/1/4/131407005/2272387.pdf
    • http://gozab.ddssullivan.com/uploads/1/3/0/7/130776677/bolug.pdf
    • https://cdn.shopify.com/s/files/1/0430/7278/2489/files/67018723900.pdf
    • https://cdn.shopify.com/s/files/1/0430/2913/5521/files/900_english_business_sentences.pdf
    • https://cdn.shopify.com/s/files/1/0432/3970/2687/files/sulapamive.pdf
    • https://cdn.shopify.com/s/files/1/0435/7334/6472/files/carte_de_tous_les_pays_du_monde.pdf
    • https://cdn.shopify.com/s/files/1/0430/8893/7120/files/ruxamofe.pdf
    • https://cdn.shopify.com/s/files/1/0430/4896/0151/files/fufufopexarepemose.pdf
    • https://cdn.shopify.com/s/files/1/0431/5188/4445/files/8019712974.pdf
    • https://cdn.shopify.com/s/files/1/0429/1729/8329/files/classical_beam_theory.pdf
    • https://cdn.shopify.com/s/files/1/0440/0319/7078/files/accounting_principles_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0447/9972/1633/files/dental_product_shopper_buyers_guide.pdf
    • https://cdn.shopify.com/s/files/1/0443/0843/1004/files/job_application_letter_sample_for_any_position.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_off000055e9.bin
7ad584dee2d84c94befeee06265cee05e8e22b1993d62c906c3503f3afcbb3f8
pdf-font-stream PDF embedded font (sfnt) at offset 0x55E9 5320 bytes
font_01_sfnt_off00006825.bin
4feb32840c55558b2a3f68135f01725fb627991b87c1b95ea6e9d4bde68d7f21
pdf-font-stream PDF embedded font (sfnt) at offset 0x6825 10172 bytes