Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c7ec0f58bb9244…

MALICIOUS

PDF

38.7 KB Created: 2020-09-18 01:06:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 374767ef2d5140c9f075c74c8f391614 SHA-1: a36eef601ded75c3e744eb9bd02c4efb03010dd3 SHA-256: 84c7ec0f58bb924469fe873c61eb7f94d5c84d4a1cebe04e3c44f4687b1f63cd
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.club, which is likely intended to lead the user to a malicious site. The document body and embedded URLs suggest a lure related to educational content, specifically a '4th grade gold dust or bust script', which is a common tactic for phishing or malware delivery. The PDF_SEO_LINK_FARM heuristic indicates a large number of links, many pointing to benign Shopify URLs, likely to mask the malicious redirector.

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.club/wix?keyword=4th+grade+gold+dust+or+bust+script
    • http://zotigide.thegolphincollection.com/uploads/1/3/1/8/131871674/567af6fdc9d0.pdf
    • http://files.schoolmastermiller.com/uploads/1/3/0/7/130739379/0b44fe.pdf
    • http://files.goldkeel.com/uploads/1/3/1/4/131436956/d3d932a1490d7c.pdf
    • http://files.angela-paul.com/uploads/1/3/1/0/131070469/ziwubega_konidojagej_pemesazefesifak.pdf
    • https://cdn.shopify.com/s/files/1/0435/7016/7967/files/how_to_exit_nano.pdf
    • https://cdn.shopify.com/s/files/1/0437/4600/1045/files/powerpoint_templates_science_project.pdf
    • https://cdn.shopify.com/s/files/1/0428/9737/5399/files/nugobajodamiwofazutelo.pdf
    • https://cdn.shopify.com/s/files/1/0428/2544/9628/files/39633602369.pdf
    • https://cdn.shopify.com/s/files/1/0431/7013/6218/files/ropemogawoxam.pdf
    • https://cdn.shopify.com/s/files/1/0439/9126/9534/files/hallelujah_chorus_handel.pdf
    • https://cdn.shopify.com/s/files/1/0429/7788/6367/files/liver_cancer_information_in_marathi.pdf
    • https://525e7f9d-e5e0-4963-b311-84b9ffbb82a6.filesusr.com/ugd/f523c3_dbd3da8ceba34a19ba8e50d71c631f59.pdf?index=true
    • https://cd99dd4f-a341-4ff2-842e-5bbe8792f0b0.filesusr.com/ugd/29c71c_b1d0a6be67cf44eeb9f39edb3ffe32c1.pdf?index=true
    • 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_off00005863.bin
6cb382e0047970ceb09b8ba0ed5f44d6abde110f93aa58473fdd06f90b19351f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5863 5468 bytes
font_01_sfnt_off00006af5.bin
8cfd45268ca4bddc9903610a428c584faa73a9a1e1a656ce92c1eae7a0c2b702
pdf-font-stream PDF embedded font (sfnt) at offset 0x6AF5 10404 bytes