PDF malware analysis — malicious · 71599bb87dea5cc3

MALICIOUS

PDF

40.2 KB Created: 2020-09-07 17:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 240d21dce8f8a6461fa262775b4b158b SHA-1: 733db2620c29acefed8ac222c91df52772dacf27 SHA-256: 71599bb87dea5cc3c94a012679dd33d285865f91847e8ecffdb587f752042feb

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links, with one specifically pointing to a known malicious redirector. The document body, though partially corrupted, includes text suggesting it is a worksheet, likely a lure to encourage clicks. The presence of numerous external PDF links further indicates a link farm, a common tactic for distributing malicious content or driving 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.me/wix?keyword=infinitive+with+to+worksheet+pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://static.usrfiles.com/ugd/9ef0c3_551798bc624b4dfbb28168a0e416fb39.pdf
- https://static.usrfiles.com/ugd/b8c837_0e7bc79e0ba34dc097d6464112ca8e8f.pdf
- https://static.usrfiles.com/ugd/f967ac_a56a55bd706b4796bfc67a52d999846f.pdf
- https://static.usrfiles.com/ugd/fdd6c2_6dc3b513ab8f407a80e4a802609a9c0b.pdf
- https://static.usrfiles.com/ugd/3c2e2e_cea4a7496987402486d2b46ab81f0d7f.pdf
- https://cdn.shopify.com/s/files/1/0434/6114/8836/files/30691366625.pdf
- https://cdn.shopify.com/s/files/1/0438/3444/1885/files/after_effects_book.pdf
- https://cdn.shopify.com/s/files/1/0459/9735/9261/files/form_application_visa_korea.pdf
- https://cdn.shopify.com/s/files/1/0429/8535/7463/files/23694767151.pdf
- https://cdn.shopify.com/s/files/1/0428/5808/6556/files/75167489558.pdf
- https://cdn.shopify.com/s/files/1/0463/4676/4450/files/citroen_c4_picasso_2008_user_manual.pdf
- https://cdn.shopify.com/s/files/1/0459/2553/1815/files/57457769153.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_off00005ebf.bin` `f98925b4c8caf1418ec033ac852b2ddbcdea5c6607f6329768c02303b3cc0953`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5EBF	5040 bytes
`font_01_sfnt_off00006ff9.bin` `9f83acd8600cababb2dc251fdffed8ba134da7df652150d3bb8c2e85e2686e4b`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6FF9	10664 bytes

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