Malicious PDF — malware analysis report

Static analysis result for SHA-256 4351eaf953eff428…

MALICIOUS

PDF

46.7 KB Created: 2020-08-20 05:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8ea7f0ba2859a702a1b3486f4f3fa9c SHA-1: 7e39ab84afef0eed944e8deb9de3cf3687999dbd SHA-256: 4351eaf953eff428d1db3934f8ae4175926716344810898d06064a19f07eb4cf
152 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is designed to obscure the final destination. The document body, though heavily obfuscated, contains text related to VBA and a URL that appears to be part of a link farm. The ML classifier strongly indicated maliciousness. The primary attack vector appears to be a lure to click on the malicious link, likely leading to a phishing page or malware download.

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=set+active+worksheet+variable+vba
    • http://xuraxili.johntroypainter.com/uploads/1/3/0/9/130969746/ffbfef6a24e51b4.pdf
    • http://sesivux.kingfisher-strategy.com/uploads/1/3/2/3/132302868/9874854.pdf
    • http://vedofog.octoberpvd.com/uploads/1/3/1/6/131606337/vosubazibowaxoga.pdf
    • http://bufeg.nordtournet.com/uploads/1/3/0/7/130739723/tefatigiwibonug-samef-dobudu.pdf
    • http://files.stfrancis-stmaximilian.com/uploads/1/3/1/8/131871721/3423447.pdf
    • https://cdn.shopify.com/s/files/1/0437/7490/2423/files/32106030242.pdf
    • https://cdn.shopify.com/s/files/1/0434/1317/6469/files/zovero.pdf
    • https://cdn.shopify.com/s/files/1/0435/3576/1576/files/salon_booth_rental_agreement.pdf
    • https://cdn.shopify.com/s/files/1/0448/3937/0909/files/difijepenuziz.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/92880490986.pdf
    • https://cdn.shopify.com/s/files/1/0434/2936/3878/files/mario_benedetti_te_quiero.pdf
    • https://cdn.shopify.com/s/files/1/0438/3876/7264/files/kaforuluxowaragiroma.pdf
    • https://cdn.shopify.com/s/files/1/0447/5407/5799/files/imagenomic_portraiture_cs6.pdf
    • https://cdn.shopify.com/s/files/1/0438/9116/3291/files/92978471489.pdf
    • https://cdn.shopify.com/s/files/1/0436/8737/9094/files/html_random_image_on_refresh.pdf
    • https://cdn.shopify.com/s/files/1/0434/2225/3205/files/41434326720.pdf
    • https://cdn.shopify.com/s/files/1/0454/8096/8342/files/vemavevimesez.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c31.bin
3d25d7ec11d94558f6cb0a19c290cf0a5dc3ecf1ea719d23ae227c0428d54e56		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C31 5028 bytes
font_01_sfnt_off00007d68.bin
fd56c2db5fd4c3a1ef102060afa5e3c0e48835e319146306949d0f7775f269ba		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D68 10072 bytes
font_02_sfnt_off00009fa2.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FA2 4324 bytes

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