Malicious PDF — malware analysis report

Static analysis result for SHA-256 a704cbb229376c96…

MALICIOUS

PDF

49.2 KB Created: 2020-07-29 23:32:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ee6cd2bf4736d42c443f07eb21f0ea91 SHA-1: ba6571d9be212837f450a84abddae95d71bc2bae SHA-256: a704cbb229376c96bbbb0d713b1a5ef19ff6d397079a52724e054b6aa7befdb3
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.com'. This indicates an attempt to redirect the user to a malicious site. Additionally, the PDF is flagged as a link farm, suggesting it's part of a larger SEO-poisoning or spam campaign. The document body, though heavily obfuscated, contains keywords related to 'bunk bed plans', likely serving as a lure.

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=bunk+bed+plans+with+stairs+pdf
    • http://files.coribachman.com/uploads/1/3/1/4/131455832/posikususozidul.pdf
    • http://files.jofreeman.net/uploads/1/3/2/3/132303010/lowoxuroxamalut-sidabasowu-nexofabe-kijasalafezapi.pdf
    • http://files.flyfishinginstructors.co.uk/uploads/1/3/2/6/132681824/pogodufewan.pdf
    • https://cdn.shopify.com/s/files/1/0433/9476/0862/files/kuwoxulasoletijozeda.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kilezibuvi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/93380222008.pdf
    • https://cdn.shopify.com/s/files/1/0433/6222/2232/files/19528550227.pdf
    • https://cdn.shopify.com/s/files/1/0429/1097/4111/files/95306989364.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57148414383.pdf
    • https://cdn.shopify.com/s/files/1/0435/0397/6614/files/97980487836.pdf
    • https://cdn.shopify.com/s/files/1/0427/8799/5814/files/12643461112.pdf
    • https://cdn.shopify.com/s/files/1/0429/5000/0791/files/26250813436.pdf
    • https://cdn.shopify.com/s/files/1/0434/4774/6721/files/50052528956.pdf
    • https://cdn.shopify.com/s/files/1/0434/8110/4541/files/84749750109.pdf
    • https://cdn.shopify.com/s/files/1/0432/9226/2560/files/57532687665.pdf
    • https://cdn.shopify.com/s/files/1/0438/4620/5602/files/94494812290.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/
    • https://cdn.shopify.com/s/fi

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000080ed.bin
2151853131bc2e3012e9f3d18e957d845dd00752afb88666542f04839b1f1dc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x80ED 5244 bytes
font_01_sfnt_off000092bd.bin
94a451cd072ca326ed03b5d8cd55f52c1c26306164c037f1eabad4495733d465
pdf-font-stream PDF embedded font (sfnt) at offset 0x92BD 10792 bytes