PDF malware analysis — malicious · b4ec13d746925530

MALICIOUS

PDF

38.4 KB Created: 2020-08-11 00:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)

MD5: 06160608622857a8ec4dced25926c857 SHA-1: 09b075074b3b84807a2c13a520054ddc59d657e0 SHA-256: b4ec13d74692553092aea1ffb8690129f6fd7c6ecf4e5b50241f1f01dc3bd65f

150 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the heuristic PDF_MALICIOUS_REDIRECTOR_LINK. The primary malicious URL is https://ttraff.ru/pify?keyword=arabic+letter+flashcards+pdf. The document body, though heavily obfuscated, also contains this URL, suggesting a lure to disguise malicious activity. The ML classifier strongly supports the malicious verdict.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 3

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.
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=arabic+letter+flashcards+pdf
- http://files.porterridgeband.org/uploads/1/3/0/7/130775229/tedigiselirejij-kitunesorem-datem.pdf
- http://fajaru.inspirerconsulting.com/uploads/1/3/2/7/132741555/wupokigobitajetino.pdf
- http://files.sylvesterelementary.org/uploads/1/3/1/3/131381450/6244228.pdf
- http://bebovu.jewelwing.com/uploads/1/3/1/0/131070374/zabutonejabadibuwipu.pdf
- https://cdn.shopify.com/s/files/1/0429/0409/2839/files/66931862922.pdf
- https://cdn.shopify.com/s/files/1/0427/9648/2727/files/punjab_text_book_physics_9th_class_english_medium.pdf
- https://cdn.shopify.com/s/files/1/0431/0777/8711/files/50917431821.pdf
- https://cdn.shopify.com/s/files/1/0433/7578/8184/files/rinnai_tankless_water_heater_manual.pdf
- https://cdn.shopify.com/s/files/1/0433/5930/5880/files/tamuwiritataxaxupu.pdf
- https://cdn.shopify.com/s/files/1/0432/3662/2498/files/20534530905.pdf
- https://cdn.shopify.com/s/files/1/0431/8828/9694/files/wadapulame.pdf
- https://cdn.shopify.com/s/files/1/0436/8728/0790/files/bin_sachivalay_paper_2020_download.pdf
- https://cdn.shopify.com/s/files/1/0437/0723/6503/files/31751890745.pdf
- https://cdn.shopify.com/s/files/1/0433/4944/2715/files/sound_of_silence_text.pdf
- https://cdn.shopify.com/s/files/1/0429/5802/8959/files/tavugejed.pdf
- https://cdn.shopify.com/s/files/1/0440/2829/7381/files/romewigoxegokidaroweze.pdf
- https://cdn.shopify.com/s/files/1/0433/9970/8821/files/pathophysiology_of_sepsis.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
`stream_004_off00005dcc.bin` `249c5b6d34f1b9af3a33b288cf4ad74f1306b7dbd70a675500d815f14c4d7953`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5DCC	14512 bytes
`font_00_sfnt_off00004b9a.bin` `a03ee3719d440641df11a6424a92b314ade41c64551c1865ac73350a0250f707`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4B9A	5372 bytes

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