Malicious PDF — malware analysis report

Static analysis result for SHA-256 2153968db45c476e…

MALICIOUS

PDF

51.0 KB Created: 2020-08-09 02:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e28e97465c3c6a29cc7d0ace0cdeae1c SHA-1: 20082074cbbedb103e899c6912e530d626cafea5 SHA-256: 2153968db45c476eed1d7b599349db107da6de4e0ce0b1a3cb4d7d7c467bfd01
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The PDF also exhibits characteristics of a link farm, with numerous embedded links, many hosted on Shopify, likely for SEO manipulation to increase visibility of malicious content. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=devi+bhagavatam+telugu+pdf+download
    • http://files.design-strong.com/uploads/1/3/1/4/131483343/panuzufepe.pdf
    • http://files.laplayaatthestrand.com/uploads/1/3/2/6/132682663/fexogobun.pdf
    • http://files.eatforfeats.com/uploads/1/3/0/9/130969884/33863ef5b9c41f.pdf
    • https://cdn.shopify.com/s/files/1/0431/5892/9570/files/17307471591.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4507/files/sewinojol.pdf
    • https://cdn.shopify.com/s/files/1/0429/9912/0033/files/kixatiburibimopuko.pdf
    • https://cdn.shopify.com/s/files/1/0429/6019/1637/files/talorexalote.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/cfop_all_algorithms.pdf
    • https://cdn.shopify.com/s/files/1/0431/1977/1799/files/vofazugupilije.pdf
    • https://cdn.shopify.com/s/files/1/0434/9041/0658/files/bokelupuzonavimedove.pdf
    • https://cdn.shopify.com/s/files/1/0433/3774/4552/files/64004745008.pdf
    • https://cdn.shopify.com/s/files/1/0439/6577/6030/files/10009054624.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dedepisolutiri.pdf
    • https://cdn.shopify.com/s/files/1/0428/6509/8918/files/vajuwujewugopu.pdf
    • https://cdn.shopify.com/s/files/1/0431/5293/3021/files/nuworigavafabukegi.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3356/files/44892876341.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7701/files/search_engines_information_retrieval_in_practice_free_download.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/1/0432/8249/7701/files/search_engines_information_retrieval_in_practice_free

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b45.bin
f488459c65c34a8da7f466b1363e602337db1a1a2e896344906f33c10bdccc45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B45 5356 bytes
font_01_sfnt_off00005d74.bin
9303023db0a6e0120d4f6d9c8e69a733d656c245abe41296de5a070a3509bf9c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D74 8960 bytes
font_02_sfnt_off000077c0.bin
7206ca3e2c5c31d57892e78846d177cca03875e99c063fa5f9e0cb39087a7273		 pdf-font-stream PDF embedded font (sfnt) at offset 0x77C0 10100 bytes
font_03_sfnt_off00009a92.bin
a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9A92 16204 bytes
font_04_sfnt_off0000afbf.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBF 4324 bytes

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