PDF malware analysis — malicious · 054e7fb3ca41a1be

MALICIOUS

PDF

39.3 KB Created: 2020-08-31 13:29:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 133d02c064ddf14aabf13f2048681a1e SHA-1: 71403935c661cfcf4582fb12cde3abafec31b834 SHA-256: 054e7fb3ca41a1bec387369185971d3b4eae11bb9ea1a1d2b4b2547c275ea7b2

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, with one heuristic specifically identifying it as a malicious redirector. The document body, though heavily obfuscated, contains a URL that appears to be a lure for downloading a PDF, which likely leads to the malicious redirector. The ML classifier also strongly indicated maliciousness.

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=bsc+agri+books+pdf+download
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/de02f3_9b720e8881244a3b948fbf7f7e38af6b.pdf
- https://static.usrfiles.com/ugd/34e21e_0b9d7f8afc5248088237326096833e73.pdf
- https://static.usrfiles.com/ugd/b8c837_dd683b0eeb184becba5b53404da3e5b5.pdf
- https://static.usrfiles.com/ugd/b8c837_19351ba1901849da88e26b143cfeac5e.pdf
- https://static.usrfiles.com/ugd/b8c837_9ca48b4d45ee4c709512ca0c6f12829c.pdf
- https://static.usrfiles.com/ugd/b8c837_68914df9eb4a44ecb18c928ff4647439.pdf
- https://static.usrfiles.com/ugd/735189_bce92f55c5604f80bda669d850a11094.pdf
- https://static.usrfiles.com/ugd/b8c837_e1392cf124544ada8d2b309ecddaf9ff.pdf
- https://cdn.shopify.com/s/files/1/0434/6249/2310/files/antrenmanlarla_matematik_4_konular.pdf
- https://cdn.shopify.com/s/files/1/0434/1969/7310/files/wejojelunevudopifeneno.pdf
- https://cdn.shopify.com/s/files/1/0427/9071/5548/files/sukajumipakolalamudiju.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20675343362.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/
- http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off00005973.bin` `6041fc45e657d27a1569a84c6b9f35e6b159ce71c12234dd2e3140c1e7c21ecb`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5973	5668 bytes
`font_01_sfnt_off00006cde.bin` `0f5b970b0e64601718a584c8115e1641fbae429b8cedb9ace947d28d8d1ffdca`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6CDE	10588 bytes

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