PDF malware analysis — malicious · 54613ebe64d4121d

MALICIOUS

PDF

80.4 KB Created: 2020-08-21 20:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 21c02ac8235c12ee5224ff8c8088ef95 SHA-1: 75180fd4eb521d22dfda9f895d596ccc7a9f60d4 SHA-256: 54613ebe64d4121d1c0224f51d81ded453e5179b44cc0ec52af43b90b39a5726

154 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body and embedded links suggest a lure to download further content, likely malicious, disguised as a novel PDF. The primary malicious IOC is the redirector URL.

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/pify?keyword=ascendance+of+a+bookworm+novel+pdf
- http://files.christinasdaytrips.com/uploads/1/3/2/7/132740764/11960fcb9d.pdf
- https://cdn.shopify.com/s/files/1/0430/4040/7701/files/toxefuximopiwafi.pdf
- https://cdn.shopify.com/s/files/1/0438/1841/8333/files/balance_sheet_equation.pdf
- https://cdn.shopify.com/s/files/1/0437/3518/7605/files/51851902841.pdf
- https://cdn.shopify.com/s/files/1/0436/3298/4222/files/house_rooms_english_worksheets.pdf
- https://cdn.shopify.com/s/files/1/0433/6232/0536/files/10089836888.pdf
- https://cdn.shopify.com/s/files/1/0431/0335/5034/files/pifaj.pdf
- https://cdn.shopify.com/s/files/1/0436/8446/2745/files/89309207939.pdf
- https://cdn.shopify.com/s/files/1/0437/3689/1544/files/xowutimemep.pdf
- https://cdn.shopify.com/s/files/1/0436/3649/0398/files/architectural_building_design_concept.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 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000a707.bin` `05e7b236bf16797c4e222275827f84ed542e833c954af2c2c9247ee8df682ad9`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA707	22940 bytes
`font_01_sfnt_off0000f01f.bin` `82b5d98feee00e100b775edc768210e3c5e2327ece105adc95a95e17a6b83e17`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xF01F	5644 bytes
`font_02_sfnt_off0001034b.bin` `7f226cf9a79b69166b0f862b9e63a307f8bce2fceff6530d5d064b9830d9e508`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x1034B	15336 bytes

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