Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b85afc72254d6f9…

MALICIOUS

PDF

44.6 KB Created: 2020-08-14 01:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 20c4063cc4f7394f8151ea1a05d545fc SHA-1: 2a29332cd67c7c2b54809141f4b0746c56c4e5f6 SHA-256: 2b85afc72254d6f9f6dd897cf89ce2cf8e146a9d1e1a6fedb8f3ff1d57b7191c
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one heuristic specifically identifying a 'PDF SEO Link Farm' and another flagging a 'PDF Malicious Redirector Link' pointing to 'ttraff.com'. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the suspicious URL 'https://ttraff.com/pify?keyword=bmp+test+full+form', suggesting a lure or redirection mechanism. No scripts were extracted from this sample.

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.com/pify?keyword=bmp+test+full+form
    • http://files.amandahudsonart.com/uploads/1/3/0/7/130738593/9162701.pdf
    • http://files.damioncera.com/uploads/1/3/0/7/130776409/3d49a6118.pdf
    • http://files.jayadeviarts.com/uploads/1/3/1/0/131070011/vonalagigivajusudet.pdf
    • http://fevujop.pyester.com/uploads/1/3/0/7/130776167/xulifapokimadu_wigobag_bazulogu_rinoxulesa.pdf
    • https://cdn.shopify.com/s/files/1/0438/9021/3019/files/kojuxesuradifiripavoked.pdf
    • https://cdn.shopify.com/s/files/1/0431/6292/7253/files/waterfall_vs_agile.pdf
    • https://cdn.shopify.com/s/files/1/0436/1591/2098/files/sunuribe.pdf
    • https://cdn.shopify.com/s/files/1/0432/1037/5325/files/laundromat_business_plan_startup.pdf
    • https://cdn.shopify.com/s/files/1/0432/8266/1526/files/dragon_age_inquisition_prima_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/7092/2655/files/bibakowaman.pdf
    • https://cdn.shopify.com/s/files/1/0427/9818/6652/files/79305705006.pdf
    • https://cdn.shopify.com/s/files/1/0432/3459/0875/files/24552150985.pdf
    • https://cdn.shopify.com/s/files/1/0436/0250/9987/files/6_volt_battery_charger_circuit_diagram.pdf
    • https://cdn.shopify.com/s/files/1/0440/5493/7765/files/96422329824.pdf
    • https://cdn.shopify.com/s/files/1/0431/6309/1112/files/90043044536.pdf
    • https://cdn.shopify.com/s/files/1/0427/6885/9303/files/jusuridagakudusatusalube.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_off0000695a.bin
5fa7490e50b1961e6c9d4cc5c4c0aef6ab7ad886e03e13f99d95262e8debb96f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x695A 4888 bytes
font_01_sfnt_off000079e8.bin
a45c20b8000ea7bd936f115feac1d03cbbcada662d15fb2395d0d098dabbc6d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79E8 13828 bytes

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