Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd4f7b0e6463349…

MALICIOUS

PDF

46.8 KB Created: 2020-08-29 03:28:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 334b93f2b116b115e433ddbd348be341 SHA-1: a8118b19fa79c04149bf7952e2f364d25d3c14d6 SHA-256: bbd4f7b0e64633498adb370e8e5e2930c0b455ee033ab9f1bebcd14514ad4dc6
152 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The ML classifier also strongly flagged this PDF as malicious. The presence of a link farm heuristic indicates a potential SEO poisoning or spamming campaign to distribute malicious content.

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/wix?keyword=tabla+de+transformadas+de+laplace+dennis+zill
    • https://static.usrfiles.com/ugd/b8c837_a309032ba28d4d289b36c7be125dabd7.pdf
    • https://static.usrfiles.com/ugd/b8c837_6d9ff9cda2bc4181aee707072540467a.pdf
    • https://static.usrfiles.com/ugd/b8c837_b44f45c77d03440097d8429de3e8c9a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_21791645619e4342be4c9148618b81a8.pdf
    • https://static.usrfiles.com/ugd/b8c837_1285a1d03aaa434186f99d8ee747aa87.pdf
    • https://static.usrfiles.com/ugd/b8c837_2dcfd9fb9f47429f95d6340a8be0a926.pdf
    • https://static.usrfiles.com/ugd/b8c837_1e0d82353fcf42f18595ed52e8a2d523.pdf
    • https://cdn.shopify.com/s/files/1/0430/7720/6178/files/adjective_form_of_earthy.pdf
    • https://cdn.shopify.com/s/files/1/0450/2857/3334/files/oxford_discover_1_teacher_s_book.pdf
    • https://cdn.shopify.com/s/files/1/0437/8542/0949/files/kimefefi.pdf
    • https://cdn.shopify.com/s/files/1/0435/0204/3288/files/basaglar_package_insert.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xibazukikamemawamiwemin.pdf
    • https://cdn.shopify.com/s/files/1/0462/4167/7472/files/jivagaxobobolotixodewewol.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/files/1/0433/0687/7080/files

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006acf.bin
9a98723dae936e7c7c8d502cfbcf27bf9f93cff28ba6a06675a6a95244fbc4de
pdf-font-stream PDF embedded font (sfnt) at offset 0x6ACF 1696 bytes
font_01_sfnt_off000072f9.bin
5b003d2a3e324e23953bdb71b67d5f5d0a51a5ff62e13e8c218264bd16429832
pdf-font-stream PDF embedded font (sfnt) at offset 0x72F9 5440 bytes
font_02_sfnt_off00008565.bin
2a50ef2fbdbac7d16f956864389cd0c3e57d91bd43efc1cdef9c85e3dca27eae
pdf-font-stream PDF embedded font (sfnt) at offset 0x8565 11780 bytes