PDF malware analysis — malicious · 0a2ceffce256c438

MALICIOUS

PDF

40.1 KB Created: 2020-09-16 07:32:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: dca9bbede507179ae1fc90e79da45591 SHA-1: 2a540278012fa83e59a57375948f5683332d437e SHA-256: 0a2ceffce256c438c2c7889c2ee1427e578854bf1f6648c517c10ed832f58fd3

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that point to a known malicious redirector, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though garbled, contains text suggesting a lure related to a style guide, which is then followed by the malicious URL. The ML classifier also strongly indicated maliciousness. The presence of numerous external PDF links suggests a link farm or SEO poisoning attempt to distribute malicious content.

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.club/pify?keyword=associated+press+style+guide+military+rank
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/ac51ce_da82132f15134e2f8af562114567c163.pdf
- https://static.usrfiles.com/ugd/4cf28d_26f7a91a11784eefa1792ccf5dbf783d.pdf
- https://static.usrfiles.com/ugd/cece23_da208dc8616a4f9195011dcda76b316a.pdf
- https://static.usrfiles.com/ugd/37987b_98393cbce811472aab11c8b021bc3d15.pdf
- https://static.usrfiles.com/ugd/3e87bf_934483cd324349dd97b09262d9f19b3b.pdf
- https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kafojisiguzisov.pdf
- https://cdn.shopify.com/s/files/1/0447/0479/2729/files/xelapibalife.pdf
- https://static.usrfiles.com/ugd/800b88_180f5d89571b4109ab9958a31df3805f.pdf
- https://static.usrfiles.com/ugd/d9d1f5_43effe76a3384e579f735ea5297a2788.pdf
- https://static.usrfiles.com/ugd/7041e4_9dcf73d871ba45f9a84f272dc7d8aaa4.pdf
- https://static.usrfiles.com/ugd/b8c837_6440e4b34fa44aa18d9dd6a34df21ee9.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_off00005743.bin` `b8cefb01bcab7424ee21c21a5687fead9db7d8b3db7d0ae34ba30081c5e2972c`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5743	5548 bytes
`font_01_sfnt_off00006a1b.bin` `e35ed16e20c283dc279a9b2298357dc5c9d39395257fe470cbdc0e38a1c90e71`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6A1B	13128 bytes

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