PDF malware analysis — malicious · 70bca1fadd08e742

MALICIOUS

PDF

32.9 KB Created: 2020-08-25 19:50:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 98fe8f03554723efc19b852241d5970c SHA-1: 1dd9c6b37534f5cfe09f1f65ad6f28493376d7c6 SHA-256: 70bca1fadd08e742128ec81b0d654a086f4491e3de04649c56a7a6bd022dd641

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body and heuristics indicate an attempt to disguise this as a utility, likely to trick users into clicking through to malicious sites. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=hwp+to+pdf
- http://wunefim.frenchtwistmn.com/uploads/1/3/0/8/130874359/vurimujumibafa-dixejalogom.pdf
- http://files.graffitiwgratitude.com/uploads/1/3/0/7/130738814/808e7b1556b9ad.pdf
- http://luraviso.kitchenformat.net/uploads/1/3/0/8/130814328/winuzapuz.pdf
- http://www.ascendercorp.com/
- http://www.ascendercorp.com/typedesigners.html
- https://cdn.shopify.com/s/files/1/0430/5554/6517/files/zeduzafuvofupumatov.pdf
- https://cdn.shopify.com/s/files/1/0430/2631/7473/files/netefamog.pdf
- https://cdn.shopify.com/s/files/1/0438/2267/8173/files/27250302000.pdf
- https://cdn.shopify.com/s/files/1/0431/6961/1930/files/junaboru.pdf
- https://cdn.shopify.com/s/files/1/0434/3260/7900/files/zulafukubabikus.pdf
- https://cdn.shopify.com/s/files/1/0433/2571/8678/files/amend_pages.pdf
- https://cdn.shopify.com/s/files/1/0431/5791/3762/files/tumoganaduvubibilamozu.pdf
- https://cdn.shopify.com/s/files/1/0429/5675/1002/files/antenna_nptel.pdf
- https://cdn.shopify.com/s/files/1/0462/8132/6752/files/77293809635.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_off00004571.bin` `6f6a7cb71aa226aadc4958c3e47e1683c41567a6c1d61344787da27b66974cc8`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4571	4572 bytes
`font_01_sfnt_off00005521.bin` `566a079b893bd56a8b69077b1e1bab3783205475d76c79f9a3c3d4841ab3edf1`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5521	10020 bytes

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