PDF malware analysis — malicious · 983f53ebad760b7a

MALICIOUS

PDF

39.2 KB Created: 2020-09-12 23:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: d5543fc357d8c8e636b7956f736b208e SHA-1: 33da28be03ba1bc5852f21dd2f0d607e033b9133 SHA-256: 983f53ebad760b7af47683e94fedc8ddf1575f80d5e4aedca19878b145056926

152 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, which leads to a URL containing 'force format sd card android apk'. This suggests a social engineering lure to trick users into downloading potentially malicious Android applications. The PDF also exhibits characteristics of a link farm, with numerous external links, many of which point to PDF files hosted on various domains. The ML classifier strongly flagged this PDF as malicious.

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=force+format+sd+card+android+apk
- http://files.theinsightfulmum.com/uploads/1/3/0/8/130874218/gilopakugokuj_zorigasirol.pdf
- http://files.lvccpp.com/uploads/1/3/1/1/131164185/sutenoto-xovad-zujevam.pdf
- http://files.roxstardance.com/uploads/1/3/1/3/131398020/9896873.pdf
- https://cdn.shopify.com/s/files/1/0430/8477/5577/files/verepixuvoxusamelajup.pdf
- https://cdn.shopify.com/s/files/1/0433/1218/5502/files/60677102441.pdf
- https://cdn.shopify.com/s/files/1/0431/8589/7627/files/zitowiwanevulo.pdf
- https://cdn.shopify.com/s/files/1/0432/3993/2067/files/15218032362.pdf
- https://cdn.shopify.com/s/files/1/0432/2643/1652/files/calcestruzzo_armato.pdf
- https://static.usrfiles.com/ugd/6116da_927be63ea7b44ce7bace78f717bc3b14.pdf
- https://static.usrfiles.com/ugd/ff68bb_55b4ef459e0e413c84d0e1d98949c92a.pdf
- https://static.usrfiles.com/ugd/717a42_d95ae76468b44b6eb18eee0e2b91daa6.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_off00005bb4.bin` `530da7abcc17a3a7eba26dd2ca58bb7fcd5870127ecf8f8bc1289bdb75bf817e`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5BB4	5288 bytes
`font_01_sfnt_off00006d9e.bin` `56d96fc2f6821c9345440a6e64cee4f8f05cfde15a2da3670d38c43c6ea5adff`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6D9E	10260 bytes

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