PDF malware analysis — malicious · 311dfded1b612273

MALICIOUS

PDF

38.5 KB Created: 2020-09-04 13:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 249b3d00d059e1f897d62c3e0084afc0 SHA-1: 9c623ba694d6040bb48ccb6533d04a7bc47568af SHA-256: 311dfded1b61227368b4e5617e12b249a54dbf48d790b5a11e03fd456d3cbac4

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.link/wix?keyword=blackberry+9900+software+update'. This URL is presented within the document body, suggesting a social engineering lure to trick users into clicking it. The presence of a large number of external PDF links, many pointing to benign content but originating from a redirector, further supports a link-farming or redirection-based attack. 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.link/wix?keyword=blackberry+9900+software+update
- https://static.usrfiles.com/ugd/b8c837_b5eb5ae4d6544599a977c6d99d24de4d.pdf
- https://static.usrfiles.com/ugd/c63dba_beb052a68a42407baa4cfd6f1e90c520.pdf
- https://static.usrfiles.com/ugd/b8c837_ba4fcba78bb44246888a06045ce488c5.pdf
- https://cdn.shopify.com/s/files/1/0433/8073/6156/files/2000_honda_accord_repair_manual_download.pdf
- https://static.usrfiles.com/ugd/b16523_311046dfb480414cbf97482c98406d30.pdf
- https://static.usrfiles.com/ugd/35dc59_398f3e40ac194c1295392e4972d76353.pdf
- https://cdn.shopify.com/s/files/1/0437/1241/3851/files/xuvezuxeronami.pdf
- https://cdn.shopify.com/s/files/1/0431/5535/7852/files/ditajifavizaja.pdf
- https://cdn.shopify.com/s/files/1/0437/2371/8805/files/kasepimoxevixaka.pdf
- https://cdn.shopify.com/s/files/1/0431/4398/7361/files/spectrum_copyright_notice.pdf
- https://cdn.shopify.com/s/files/1/0435/2724/1879/files/aryaman_tv_serial.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_off00005622.bin` `4a29264b087c96c8fcb352a9ef85bad6e2d53b870ecbf79cc8860a3cff31bfb0`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5622	5896 bytes
`font_01_sfnt_off00006a5b.bin` `a71673da6a63d1f47e9189c374d2669947e4831312dd5dfaeb5f137a8b1730b5`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6A5B	10216 bytes

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