PDF malware analysis — malicious · 75319a1a36717083

MALICIOUS

PDF

41.2 KB Created: 2020-08-31 07:52:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: ad99d175b440571185b53fd6ce717c0f SHA-1: 3aab96c8c8eb2d5b8022e03e353a489c255178a8 SHA-256: 75319a1a36717083a27fe222e9332519195dfe684d0e6a5a69577cda95f81c07

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF file contains numerous embedded links, with one pointing to a known malicious redirector. The document body, though heavily obfuscated, also contains the URL for the malicious redirector. The presence of a large number of external links suggests a link farm or SEO poisoning attempt, likely to drive traffic to malicious sites.

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=reglas+de+integracion+multiplicacion
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/d9d1f5_9dc4d3454f7a45a3a9d8735dd669b15d.pdf
- https://static.usrfiles.com/ugd/b8c837_f52ec25b35d0407d8f27524e9b91a89d.pdf
- https://static.usrfiles.com/ugd/73c254_79a5de26b07a4aab9b42163c87783bfe.pdf
- https://static.usrfiles.com/ugd/c1de29_45ad8d9fe7934fbf9c12490766422d0d.pdf
- https://static.usrfiles.com/ugd/cc14e4_ff19c7b7d1a54cc7937f37a1846bfc80.pdf
- https://static.usrfiles.com/ugd/b8c837_9626813987cf4cf2a2853db0e124cfbc.pdf
- https://static.usrfiles.com/ugd/9d869b_7dcd226c7045434999679c672e58c306.pdf
- https://cdn.shopify.com/s/files/1/0430/4224/2709/files/giziridodabizerufujotila.pdf
- https://cdn.shopify.com/s/files/1/0437/0097/7816/files/4003863156.pdf
- https://cdn.shopify.com/s/files/1/0430/8992/0154/files/space_marine_codex_7th_edition.pdf
- https://cdn.shopify.com/s/files/1/0429/1778/9863/files/jidowodepe.pdf
- https://cdn.shopify.com/s/files/1/0428/6647/5174/files/35017848491.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_off0000598a.bin` `5b222b1b833725d2810a23b9689310d605884bde51b31bac46c15835bff046dd`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x598A	5400 bytes
`font_01_sfnt_off00006bd0.bin` `a722223283ac8df207d234719877f79e59ee63091d7272ac262d80fae134bad6`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6BD0	13944 bytes

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