Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6a4d750db460689…

MALICIOUS

PDF

44.9 KB Created: 2020-08-09 20:41:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0db2b8622e139656b6b0c752e8c6ab3 SHA-1: 7b05f617fb35b6f529dd747342b04805e9fc4154 SHA-256: d6a4d750db46068903a2ae05403f4d0f6dc7a40d9d812a55de73d9ea8e5890a6
152 Risk Score

Malware Insights

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

The PDF document exhibits malicious behavior by hosting a large number of embedded links, identified as a PDF link farm. These links, while some point to benign Shopify URLs, ultimately redirect through a malicious domain, ttraff.com. This suggests an attempt to lure users into clicking through to potentially harmful content or phishing sites. The ML classifier strongly supports the malicious verdict.

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=bsc+maths+first+year+syllabus+pdf
    • http://files.stephgardner.com/uploads/1/3/2/7/132740619/gajojugirabivo-kobaj-nobigopi-lowevuxu.pdf
    • http://files.keikosensei.com/uploads/1/3/0/7/130739163/2019827.pdf
    • http://files.naturalartgardencenter.com/uploads/1/3/1/4/131437924/5647915.pdf
    • http://files.lacinefest.org/uploads/1/3/0/7/130740624/1232464.pdf
    • https://cdn.shopify.com/s/files/1/0432/8266/1526/files/ntzoufras_bayesian_modeling_using_winbugs.pdf
    • https://cdn.shopify.com/s/files/1/0433/3184/6296/files/zatodugomiwovi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8577/files/15831263415.pdf
    • https://cdn.shopify.com/s/files/1/0429/5180/3033/files/6617235000.pdf
    • https://cdn.shopify.com/s/files/1/0429/2853/7753/files/83797831564.pdf
    • https://cdn.shopify.com/s/files/1/0432/8305/4757/files/29675010032.pdf
    • https://cdn.shopify.com/s/files/1/0433/6877/5841/files/persona_bergman_analysis.pdf
    • https://cdn.shopify.com/s/files/1/0428/1214/5823/files/54627121354.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21533622499.pdf
    • https://cdn.shopify.com/s/files/1/0432/1335/7214/files/67921599037.pdf
    • https://cdn.shopify.com/s/files/1/0431/1141/5965/files/42083867426.pdf
    • https://cdn.shopify.com/s/files/1/0435/5706/0769/files/peltier_effect_project.pdf
    • https://cdn.shopify.com/s/files/1/0439/4136/3870/files/bengali_book_file_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/7673/0533/files/sopezekukinerilen.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_off00006f75.bin
e7b1611053f453ffb16e7b2e69baaf39c63762b3de1d9659c7f049457be7fac8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F75 5688 bytes
font_01_sfnt_off000082ac.bin
2918497224773152be5abfefd362a4f4bb9857ff23f5466bba93bf1d9c90d835		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82AC 10564 bytes

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