Malicious PDF — malware analysis report

Static analysis result for SHA-256 c892bd225b954fa3…

MALICIOUS

PDF

47.2 KB Created: 2020-08-08 04:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f1f9b83d253e2eecdc3920ff92d2bb1f SHA-1: ae7c6da03e3e808f14f3156cf4f52d353b0b1781 SHA-256: c892bd225b954fa3e6eca21040de338c0afd7988231d342a33a597d0e5498029
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector link farm. The primary malicious URL, https://ttraff.ru/pify?keyword=constitution+brazil+english+pdf, is designed to redirect users to further malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the extensive link farm suggests a phishing or malware distribution attempt.

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=constitution+brazil+english+pdf
    • http://files.scrimsmustangclassicyamahadtrestoration.com/uploads/1/3/1/6/131637178/xisurewunatu_xivit.pdf
    • http://files.katesmathlessons.com/uploads/1/3/1/4/131454850/3fafc47585f652.pdf
    • http://files.dotyhilldesigns.com/uploads/1/3/0/7/130739204/xepawinujudosilasaf.pdf
    • http://files.uaphialphadelta.com/uploads/1/3/0/7/130738841/36b0ccaba1b1b.pdf
    • https://cdn.shopify.com/s/files/1/0430/4925/5061/files/fifopisimiwija.pdf
    • https://cdn.shopify.com/s/files/1/0431/0981/0327/files/learning_of_excel.pdf
    • https://cdn.shopify.com/s/files/1/0433/3400/8987/files/catecismo_de_la_iglesia_catolica_vaticano.pdf
    • https://cdn.shopify.com/s/files/1/0430/2422/0321/files/xojotumimemofa.pdf
    • https://cdn.shopify.com/s/files/1/0427/8370/3206/files/65137287446.pdf
    • https://cdn.shopify.com/s/files/1/0432/6568/7717/files/31167757584.pdf
    • https://cdn.shopify.com/s/files/1/0433/4744/3865/files/repajubep.pdf
    • https://cdn.shopify.com/s/files/1/0432/8800/2710/files/goanimate_comedy_world.pdf
    • https://cdn.shopify.com/s/files/1/0430/0318/3258/files/binopivugap.pdf
    • https://cdn.shopify.com/s/files/1/0429/7146/3831/files/vigisefatomalivuruguverem.pdf
    • https://cdn.shopify.com/s/files/1/0440/0375/4142/files/tcfp_fido_login.pdf
    • https://cdn.shopify.com/s/files/1/0429/5403/1270/files/54908682041.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_off00007bee.bin
647bee2bbf4e7c9fdbeb030e583ce64b73e0b3da72c1e773b0a90560ee4f703c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BEE 5400 bytes
font_01_sfnt_off00008e3d.bin
56a16f303ec3a556be8f8f21a0e7d546bad19c2f5203ba665761fb68d7e566c0
pdf-font-stream PDF embedded font (sfnt) at offset 0x8E3D 9848 bytes