Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1df426564987258…

MALICIOUS

PDF

38.7 KB Created: 2020-08-19 22:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6b5cffc2e4b7a9d8a12dac93789a2fa SHA-1: 4dc823c2a61fad32e09c58aa2392185aa257f0bf SHA-256: d1df4265649872589466e158ded433a630b6b09913f2fb3b484fed9a43ffcc3d
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier as malicious and contains a large number of external links, indicating a link farm or SEO manipulation tactic. One of the embedded URLs, https://ttraff.ru/pify?keyword=allanson+transformer+tester, is identified as a known malicious redirector. The document body contains garbled text but also includes the same malicious URL and several Shopify-hosted PDF links, some of which are confirmed benign, but the presence of the malicious redirector is a strong indicator of malicious intent.

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.ru/pify?keyword=allanson+transformer+tester
    • http://files.aiohandcrafts.com/uploads/1/3/1/6/131606262/be475812edb9.pdf
    • http://files.pyramidbiv.com/uploads/1/3/1/4/131453967/881920.pdf
    • https://cdn.shopify.com/s/files/1/0437/1723/0741/files/72151163380.pdf
    • https://cdn.shopify.com/s/files/1/0437/8198/0321/files/case_files_family_medicine_4th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/6279/5171/files/fonek.pdf
    • https://cdn.shopify.com/s/files/1/0434/5148/2278/files/35340841810.pdf
    • https://cdn.shopify.com/s/files/1/0435/9208/9763/files/frost_dragons_rs3.pdf
    • https://cdn.shopify.com/s/files/1/0437/2443/9717/files/definicion_de_cariotipo_humano.pdf
    • https://cdn.shopify.com/s/files/1/0432/2407/2349/files/desercin_escolar_causas_y_consecuencias.pdf
    • https://cdn.shopify.com/s/files/1/0436/6457/2569/files/kegemozusunizasegemaziju.pdf
    • https://cdn.shopify.com/s/files/1/0430/7176/6690/files/project_on_working_capital_management_in_banks.pdf
    • https://cdn.shopify.com/s/files/1/0427/6820/3942/files/26164728818.pdf
    • https://cdn.shopify.com/s/files/1/0449/8161/6808/files/84377447642.pdf
    • https://cdn.shopify.com/s/files/1/0429/5180/3033/files/65359383020.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_off0000580c.bin
6a126f7475d4a17c115f315bbdbd64ef07971d8ddc303831f43a6dee09b36b69
pdf-font-stream PDF embedded font (sfnt) at offset 0x580C 4904 bytes
font_01_sfnt_off0000689e.bin
a93a26ce2246e33c516e936209a139e9eb4fa71a1fc703cc0480468d3632ecba
pdf-font-stream PDF embedded font (sfnt) at offset 0x689E 11084 bytes