Malicious PDF — malware analysis report

Static analysis result for SHA-256 b99fcf5795363022…

MALICIOUS

PDF

42.6 KB Created: 2020-08-05 14:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4453a771574ab7c0c5166e3ef6d814a SHA-1: 0e0d8d1dd1590fa4c0c0e2792c15c52cc1d8916e SHA-256: b99fcf579536302241db2ffb80a5389f9761d33c0c817b0531a44a42f494031c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, identified as a link farm. One of these links, 'https://ttraff.ru/pify?keyword=samsad+english+to+bengali+dictionary+pdf+file', points to a known malicious redirector. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is designed for malicious redirection or SEO manipulation.

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=samsad+english+to+bengali+dictionary+pdf+file
    • http://files.525pathfinder.com/uploads/1/3/1/4/131453109/fc2106920cd235d.pdf
    • http://files.alexanderbelphotography.com/uploads/1/3/0/8/130874095/1439243.pdf
    • http://files.lymarimiranda.com/uploads/1/3/0/9/130969592/vivituximosesob.pdf
    • http://files.abilenecares.org/uploads/1/3/2/6/132695782/xirime_sunakox_fikop_xalunoxipifokim.pdf
    • https://cdn.shopify.com/s/files/1/0434/1471/6572/files/44749761195.pdf
    • https://cdn.shopify.com/s/files/1/0427/6004/4710/files/gewerom.pdf
    • https://cdn.shopify.com/s/files/1/0430/1645/4305/files/44946190838.pdf
    • https://cdn.shopify.com/s/files/1/0430/0531/3177/files/44111867540.pdf
    • https://cdn.shopify.com/s/files/1/0435/4136/4890/files/jotusaxijubupifop.pdf
    • https://cdn.shopify.com/s/files/1/0430/0134/8255/files/todexeduvuzudobivaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/minirefotapobizezuloxot.pdf
    • https://cdn.shopify.com/s/files/1/0433/8044/1238/files/jadowavowikajenozep.pdf
    • https://cdn.shopify.com/s/files/1/0430/3791/7333/files/94529903138.pdf
    • https://cdn.shopify.com/s/files/1/0429/8027/8426/files/35898021052.pdf
    • https://cdn.shopify.com/s/files/1/0435/3287/7976/files/lezepilirijefupuwilita.pdf
    • https://cdn.shopify.com/s/files/1/0435/7727/8627/files/jejidotonugivoramo.pdf
    • https://cdn.shopify.com/s/files/1/0433/2843/8440/files/84646681847.pdf
    • https://cdn.shopify.com/s/files/1/0432/4933/6483/files/65499484215.pdf
    • https://cdn.shopify.com/s/files/1/0434/7202/7814/files/kunudurudedapupofizukogan.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/
    • https://cdn.shopify.com/s/files/1/0432/4933/6483/files/6549

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005848.bin
307d0cf5414776399f4518792f8a12f5f62446175c7e8dd5c578ce7c3ab4b736		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5848 5700 bytes
font_01_sfnt_off00006b70.bin
2c3cd930c9a43b0ca4e69997c9c04c0d9b5615349f4a3aea2b19c52beeee6eab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B70 10344 bytes
font_02_sfnt_off00008ec2.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EC2 4324 bytes

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