Malicious PDF — malware analysis report

Static analysis result for SHA-256 e25b5ea2fc307f56…

MALICIOUS

PDF

35.9 KB Created: 2020-08-30 07:39:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33795e210bb036b3609cbd0208568884 SHA-1: 01c83f82d205763f862697a3bbd7fc2cc2219d34 SHA-256: e25b5ea2fc307f56189376bbf60e373ab6a41aa8b53199fc3aaec48732ce1434
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at 'https://ttraff.com/wix?keyword=sullivan+precalculus+9th+edition+sol'. The document body, though heavily obfuscated, also contains this URL and other links to Shopify domains, suggesting a link farm or redirection tactic. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to lead users to harmful 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=sullivan+precalculus+9th+edition+sol
    • https://cdn.shopify.com/s/files/1/0432/1165/3277/files/minecraft_batman_videos.pdf
    • https://cdn.shopify.com/s/files/1/0434/2172/8919/files/fuvuros.pdf
    • https://cdn.shopify.com/s/files/1/0431/0210/9856/files/34957334494.pdf
    • https://cdn.shopify.com/s/files/1/0433/8008/0801/files/wonovubu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6888/3098/files/92190664750.pdf
    • https://cdn.shopify.com/s/files/1/0432/6031/3768/files/15858038931.pdf
    • https://cdn.shopify.com/s/files/1/0428/7404/4579/files/fleetguard_filter_cross_reference.pdf
    • https://static.usrfiles.com/ugd/b8c837_042bcdc01125418b8b193e4ea30b423a.pdf
    • https://static.usrfiles.com/ugd/b8c837_b1a0654b70ed4c788273c6c4335679f8.pdf
    • https://static.usrfiles.com/ugd/b13fd1_2385a31158ec429fac48798a919ae4ab.pdf
    • https://cdn.shopify.com/s/files/1/0427/9028/9574/files/vuxenejet.pdf
    • https://cdn.shopify.com/s/files/1/0432/1063/7475/files/mirogu.pdf
    • https://cdn.shopify.com/s/files/1/0437/3407/3505/files/61457506710.pdf
    • https://cdn.shopify.com/s/files/1/0431/6633/5142/files/angular_material_form_example_github.pdf
    • https://cdn.shopify.com/s/files/1/0438/4115/9333/files/48291945038.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_off00004f53.bin
ab81c97fb2e18d160f874f221244bc964f19f0478f462a94b3ffdfde9d051067
pdf-font-stream PDF embedded font (sfnt) at offset 0x4F53 5480 bytes
font_01_sfnt_off000061e3.bin
e26c8c53d568d4deee90fbd7cac1d8e1f7f8b3771e6b8c4b1686ae427e5f735b
pdf-font-stream PDF embedded font (sfnt) at offset 0x61E3 9684 bytes