PDF malware analysis — malicious · cc6f6b898bd33917

MALICIOUS

PDF

40.0 KB Created: 2020-08-20 00:08:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: ca160901fa71b2509a9298e8c63f64f9 SHA-1: 6e930d07d8688daa3d38a19b38557c5f70bad894 SHA-256: cc6f6b898bd33917b0b8f2f777f6972acaa18a6efb8458da9ad52f986007451d

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, which is indicative of a link farm. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=android+versions+in+order+of+release'. The ML classifier also strongly flagged this PDF as malicious. The document body text is largely garbled but contains the redirector URL.

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=android+versions+in+order+of+release
- http://files.pregnancylossinsilence.com/uploads/1/3/1/3/131381067/2cc57.pdf
- http://files.haywardfitnessfanatics.com/uploads/1/3/0/8/130874413/dugen.pdf
- http://files.theyogaden.net/uploads/1/3/1/6/131606035/lojuxafugenodoxaz.pdf
- http://zesowim.cedarhillouray.org/uploads/1/3/1/4/131437089/1003635.pdf
- http://files.enchantinglittleminds.com/uploads/1/3/1/4/131406173/0fcbdfc743cafe.pdf
- https://cdn.shopify.com/s/files/1/0432/1266/9089/files/togutipuk.pdf
- https://cdn.shopify.com/s/files/1/0438/3673/5650/files/zaxuvivululapusefapiju.pdf
- https://cdn.shopify.com/s/files/1/0428/9573/6988/files/act_bubble_answer_sheet.pdf
- https://cdn.shopify.com/s/files/1/0431/5607/8758/files/alman_dili_test.pdf
- https://cdn.shopify.com/s/files/1/0434/1697/7559/files/gigadijusulugolubopiva.pdf
- https://cdn.shopify.com/s/files/1/0451/5692/5594/files/biochemistry_for_nursing.pdf
- https://cdn.shopify.com/s/files/1/0457/7463/5174/files/simple_budgeting_worksheets.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_off00005f72.bin` `367b7ea6590aabc3ab7d022e9708764eb1b767607e17dafcdaa06847b433da56`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5F72	4948 bytes
`font_01_sfnt_off00007059.bin` `3928548103df38b42b988a5d32cdf13e28d184fe17cc5d26778c6ae522a1838f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7059	10264 bytes

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