Malicious PDF — malware analysis report

Static analysis result for SHA-256 9829baf33fdada29…

MALICIOUS

PDF

32.1 KB Created: 2020-08-19 06:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bec4f12ed2392f4b83897408e560e1fa SHA-1: 35497997a8364d28d2a00773781375d03f579960 SHA-256: 9829baf33fdada29c662381f332ae8b59c13ada2ae8d2dd93ccb07f49a9d0fea
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=chen+one+queen+bed+sheet+size'. Additionally, it exhibits a PDF link farm behavior, with numerous embedded links, many hosted on Shopify. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing the malicious intent.

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.com/pify?keyword=chen+one+queen+bed+sheet+size
    • http://files.empachernorthamerica.com/uploads/1/3/2/8/132814241/5471388.pdf
    • https://cdn.shopify.com/s/files/1/0428/6775/3116/files/big_green_monster_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/9121/3990/files/xagoxezadagomi.pdf
    • https://cdn.shopify.com/s/files/1/0439/7803/1262/files/parupegor.pdf
    • https://cdn.shopify.com/s/files/1/0430/1098/2041/files/45595342798.pdf
    • https://cdn.shopify.com/s/files/1/0429/9145/2314/files/36379261500.pdf
    • https://cdn.shopify.com/s/files/1/0427/9340/2524/files/33014360940.pdf
    • https://cdn.shopify.com/s/files/1/0431/2901/2381/files/35703541737.pdf
    • https://cdn.shopify.com/s/files/1/0433/4456/0281/files/rezuzidutasadogujumil.pdf
    • https://cdn.shopify.com/s/files/1/0427/6181/4172/files/compostable_plastic.pdf
    • https://cdn.shopify.com/s/files/1/0438/9853/6091/files/sergio_franco_amplificatori_operazionali.pdf
    • https://cdn.shopify.com/s/files/1/0437/0484/4442/files/android_studio_shortcuts.pdf
    • https://cdn.shopify.com/s/files/1/0435/7878/5951/files/zidutajodevogadaf.pdf
    • https://cdn.shopify.com/s/files/1/0447/1462/3130/files/ages_and_stages_social_emotional.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.

FilenameKindSourceSize
font_00_sfnt_off00004428.bin
5e958b1c6948d4e0c34c562acaad7b93891a7a8fb5a91e7a88ec5d93d9dba3c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4428 4796 bytes
font_01_sfnt_off0000546e.bin
1449f2b32fdb63091f7d63b6ac81591a1d5fa407f3052f67f57c5f130a7efe78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x546E 9252 bytes

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