Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba6ee500de665ce8…

MALICIOUS

PDF

43.3 KB Created: 2020-08-02 07:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a8ead9d3b004feb7179bdbe933b0957 SHA-1: e6c73b256c6f10237a657537bff6ef553fc78d95 SHA-256: ba6ee500de665ce87884554e64cfb6c1eade03e967623bba7bf28b7f1e3f5e3c
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, a technique often used for SEO poisoning or to host malicious content. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.ru/pify?keyword=holes+anatomy+and+physiology+11th+edition+pdf`. The document body, though heavily obfuscated, also contains this URL, suggesting the primary intent is to trick users into clicking this link, likely leading to further malicious content or exploitation.

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.ru/pify?keyword=holes+anatomy+and+physiology+11th+edition+pdf
    • http://files.mauiloagear.com/uploads/1/3/1/8/131871704/6ec73c7cadd88f8.pdf
    • http://files.ifugao-archaeological-project.org/uploads/1/3/1/0/131070072/botaluti.pdf
    • http://files.naplesbesthairsalon.com/uploads/1/3/1/6/131636954/dibuki.pdf
    • https://cdn.shopify.com/s/files/1/0437/6854/5441/files/xowipexezajokolola.pdf
    • https://cdn.shopify.com/s/files/1/0429/9109/1875/files/23283208382.pdf
    • https://cdn.shopify.com/s/files/1/0433/8457/0019/files/mizazowazavebikukunazup.pdf
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/jaralutasuv.pdf
    • https://cdn.shopify.com/s/files/1/0432/1384/8731/files/14655760666.pdf
    • https://cdn.shopify.com/s/files/1/0438/4414/1218/files/lesijosu.pdf
    • https://cdn.shopify.com/s/files/1/0434/3801/4616/files/lotilapegalej.pdf
    • https://cdn.shopify.com/s/files/1/0429/4737/9356/files/nafoketisumebiriwowef.pdf
    • https://cdn.shopify.com/s/files/1/0430/9601/5002/files/pifabiwexe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1824/files/29106365593.pdf
    • https://cdn.shopify.com/s/files/1/0431/5830/6965/files/74456433784.pdf
    • https://cdn.shopify.com/s/files/1/0431/9733/3664/files/mirijixanata.pdf
    • https://cdn.shopify.com/s/files/1/0429/5278/6074/files/xamasolevit.pdf
    • https://cdn.shopify.com/s/files/1/0433/9109/0844/files/xoxaluv.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_off00006820.bin
5af21dec5d58b22bbbc73f4291b22915d3b96c076d0f20009260aea59b9bb822		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6820 5472 bytes
font_01_sfnt_off00007aad.bin
70a4f41148a5116cfe772827ce82fee2b31a2569f4b65f25a018bf230d44bbbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AAD 10524 bytes

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