PDF malware analysis — malicious · 972e9bfb657825aa

MALICIOUS

PDF

36.1 KB Created: 2020-08-13 17:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: e19eb9e34559aeed22c521689921decc SHA-1: 944fe78c0d6087173bcdb29d58a023d665bd049b SHA-256: 972e9bfb657825aa99c8fa269ae077a94dd9dc690f90bc1e5e0d94b60d9dda2c

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a high number of embedded links, many pointing to external PDF files hosted on various domains, including Shopify. One critical heuristic indicates a link to a known malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body is heavily obfuscated and contains a URL that appears to be part of the link farm.

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/wb?keyword=tool%20holder%20types%20pdf
- http://files.kokonutgav.com/uploads/1/3/1/4/131452902/5789203.pdf
- http://files.myoutdoorvisions.com/uploads/1/3/2/3/132302940/pisatu.pdf
- http://files.righttaxes.ca/uploads/1/3/0/9/130969386/lomis.pdf
- https://cdn.shopify.com/s/files/1/0427/9477/8791/files/vaduzekibarefek.pdf
- https://cdn.shopify.com/s/files/1/0435/7265/8335/files/70879145623.pdf
- https://cdn.shopify.com/s/files/1/0434/1543/7468/files/33570894854.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vonabubabosutogoxofe.pdf
- https://cdn.shopify.com/s/files/1/0443/0639/9388/files/12508588637.pdf
- https://cdn.shopify.com/s/files/1/0434/4145/5254/files/retizizufe.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/27150836515.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mekokagowofulagifofid.pdf
- https://cdn.shopify.com/s/files/1/0437/5661/7877/files/40462837718.pdf
- https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49893706483.pdf
- https://cdn.shopify.com/s/files/1/0435/2992/8863/files/52652844502.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.

Filename	Kind	Source	Size
`font_00_sfnt_off00004f1f.bin` `a5009e9aed155ad3fc29bcc09b1f14c84b298737cd5d531f47775f8b5efe7bcc`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4F1F	4972 bytes
`font_01_sfnt_off0000600c.bin` `6d3831ac8ed53b1bcd5eced8954b6f329d7715fe9bce26ad6f3f5cf44b05e920`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x600C	10492 bytes

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