Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa94f512b0c70bb9…

MALICIOUS

PDF

48.3 KB Created: 2020-08-20 05:23:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d5197172e50f2c644758c17679d862b SHA-1: 3fb2e78481c614dbd1ca54796deba6a305c7feb4 SHA-256: aa94f512b0c70bb9061b7d6b5e4196f00c37090fc9afc4d4c0054e4c28ac52d2
152 Risk Score

Malware Insights

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

The PDF document contains a lure related to an Android phone deal, which is a common social engineering tactic. It embeds numerous links, with one specifically pointing to a known malicious redirector at 'ttraff.cc'. This redirector is likely used to obscure the final malicious destination. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports malicious intent.

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.cc/pify?keyword=android+phone+under+5000+tk+in+bangladesh
    • http://rugetebaj.samanthaleal.com/uploads/1/3/1/8/131871390/6823276.pdf
    • http://files.poderpac.com/uploads/1/3/2/6/132681308/9548353.pdf
    • http://files.clpsfamily.com/uploads/1/3/1/3/131379591/tewuso.pdf
    • http://files.neighborsbuildingbrightmoor.org/uploads/1/3/1/1/131163914/galiwerujiso-kenaxebeludunug.pdf
    • http://files.wimbornealliance.com/uploads/1/3/2/6/132695694/f05d4a893.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jewepogepavab.pdf
    • https://cdn.shopify.com/s/files/1/0432/2839/7727/files/43468838206.pdf
    • https://cdn.shopify.com/s/files/1/0437/1123/4197/files/wirixuzemujibafa.pdf
    • https://cdn.shopify.com/s/files/1/0434/3300/1126/files/adventure_time_jelly_beans_have_power.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vaxopegi.pdf
    • https://cdn.shopify.com/s/files/1/0429/1425/0905/files/73982762299.pdf
    • https://cdn.shopify.com/s/files/1/0429/5743/9129/files/atresia_de_las_vias_biliares.pdf
    • https://cdn.shopify.com/s/files/1/0430/0167/5939/files/craft_beer_brewing_process.pdf
    • https://cdn.shopify.com/s/files/1/0435/5070/3779/files/o_messianismo_no_brasil_e_no_mundo.pdf
    • https://cdn.shopify.com/s/files/1/0454/5331/2150/files/vijopewesegalexep.pdf
    • https://cdn.shopify.com/s/files/1/0433/2273/6798/files/87893554786.pdf
    • https://cdn.shopify.com/s/files/1/0427/9291/1007/files/14993876953.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_off00006e6b.bin
c46bbd248e7de360c14d7e45ce814c4450f6d6a2d32420625ab55e541db35ede		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E6B 5680 bytes
font_01_sfnt_off000081a4.bin
71c98f1f0ae2ef9333828ee85ea83c9551a83b06002846ea3a22cec639e85686		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81A4 3852 bytes
font_02_sfnt_off00008da3.bin
7ac9b000619fd58e5a982ae1488232faaa0647e80b1d2b1e2864ff53c931e400		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DA3 10448 bytes

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