PDF malware analysis — malicious · b6644f5ef3cb9d71

MALICIOUS

PDF

43.7 KB Created: 2020-09-03 03:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 171875a9437d03b4ac3e7371c30db0c0 SHA-1: d28dbc4724b541f29329c63ef9c1e602f1812de3 SHA-256: b6644f5ef3cb9d717bc4db41dbea271fdb7187fd6414ea0cfbba02a39dea4c08

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded external links, many of which point to a redirector service (ttraff.com). This suggests a link farm or phishing campaign designed to direct users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be the malicious redirection links.

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=impersonal+se+and+passive+se+worksheet
- https://static.usrfiles.com/ugd/a91264_43ab809e2b134a84b2ef7dbbb07d2057.pdf
- https://static.usrfiles.com/ugd/2486b5_ec547548bef149369e1ba480cd082d3c.pdf
- https://static.usrfiles.com/ugd/ebbcbd_8dd6d305ed984e4a82c0ff3b548429e4.pdf
- https://cdn.shopify.com/s/files/1/0431/3019/2039/files/90414950956.pdf
- https://cdn.shopify.com/s/files/1/0432/4468/3432/files/rebizodil.pdf
- https://cdn.shopify.com/s/files/1/0435/4431/4011/files/6th_grade_math_final_exam.pdf
- https://cdn.shopify.com/s/files/1/0432/2295/8248/files/bone_marrow_aspiration_procedure_steps.pdf
- https://static.usrfiles.com/ugd/b48b60_10d59de0ed6d42839d4bc6cf157bdd13.pdf
- https://static.usrfiles.com/ugd/455f95_e1a463e5f93745be9c0ac6d9152edb7b.pdf
- https://static.usrfiles.com/ugd/934fc3_2e735618c783438383a1701000156642.pdf
- https://static.usrfiles.com/ugd/89c6ad_ed2c61a929cd4d30872b0f80a4d0cb1a.pdf
- https://static.usrfiles.com/ugd/b8c837_17db77abc1ae44e0948b522787e92986.pdf
- https://static.usrfiles.com/ugd/d1d005_39c2792929904068b26f9329738787da.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_off000068bd.bin` `80df2dcd69db9318e6ab6613462bcd13c7caee5b6b87eceb8b0e38c0ffa87020`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x68BD	5352 bytes
`font_01_sfnt_off00007ad4.bin` `5d2cbdec56ee03006c16c2c5918f690f3d42c0995a849ac74a5db0bf6225c017`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x7AD4	12296 bytes

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