PDF malware analysis — malicious · 1d62efc1abc28bb2

MALICIOUS

PDF

40.3 KB Created: 2020-08-31 06:16:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: efb9b78d4010b3f97199d5f45f08828d SHA-1: e2ee0c7acc3cca44b3c18ca3a06a0dc18ad07f74 SHA-256: 1d62efc1abc28bb2f06d73f09a7bf4dc5271de69217f117a2aa498c76bda43db

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm pointing to numerous other PDFs, with the primary URL leading to a known malicious redirector. The document body text, though garbled, includes the target URL, suggesting a lure to disguise malicious activity. The ML classifier strongly indicated maliciousness, and the presence of multiple external links, including a redirector, points to a phishing or malware distribution attempt.

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.ru/wix?keyword=official+sat+study+guide+2019+pdf+free
- https://static.usrfiles.com/ugd/ef7b09_b96f10f77da24bbea7d9ffe5a0423c7c.pdf
- https://static.usrfiles.com/ugd/2e4eb4_d285b1dbf0214e299da62c6c913a736d.pdf
- https://static.usrfiles.com/ugd/5438e3_71606602878d4e478f7d944e1d529946.pdf
- https://static.usrfiles.com/ugd/865d50_5efdb8f5c005483f8a3231bf1e59bfa0.pdf
- https://static.usrfiles.com/ugd/5a1791_e351127ea42842f3998ad8d85a0bf8b8.pdf
- https://static.usrfiles.com/ugd/4dd980_76b1b6b6c69f4067b7bd27a1f61510a4.pdf
- https://static.usrfiles.com/ugd/b8c837_0ff8e9464b7e449f957abea3bc35e932.pdf
- https://static.usrfiles.com/ugd/9374a7_92c1f27958ba4826aff2751c80e57d24.pdf
- https://cdn.shopify.com/s/files/1/0444/0460/5094/files/best_calculus_book.pdf
- https://cdn.shopify.com/s/files/1/0441/2728/9496/files/nikewajupidawewuxokugeja.pdf
- https://cdn.shopify.com/s/files/1/0429/2398/3015/files/lufokuji.pdf
- https://cdn.shopify.com/s/files/1/0434/8349/6600/files/26995346997.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_off00005ce4.bin` `bef7e3399be31314f274528bd1e41d90b146bceee1049b544dbe4b9136a3c21f`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5CE4	5936 bytes
`font_01_sfnt_off0000712f.bin` `ebabc9d1436bd0fb45ad94d5a3bd261863e096bcde5acf386769ac138777df73`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x712F	10432 bytes

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