Malicious PDF — malware analysis report

Static analysis result for SHA-256 472d17041480bd00…

MALICIOUS

PDF

51.4 KB Created: 2020-08-21 21:20:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd0a0ad2d3340ecad0c3f3b9975d7920 SHA-1: b260e3df6ab238a9edfa44fe656cc578bb94349f SHA-256: 472d17041480bd0015e3829e5a6b87b44f6fd24ea0337941dca5f741ab44bc12
152 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified links pointing to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=piscicultura+practica+pdf'. Another critical heuristic indicated a large number of external PDF links, many hosted on 'cdn.shopify.com', suggesting a link farm designed to manipulate search engine results or distribute content. The document body contains garbled text but includes the same suspicious URL, reinforcing the malicious intent. 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.cc/pify?keyword=piscicultura+practica+pdf
    • http://pijipow.dcaravanviral.com/uploads/1/3/2/6/132681556/1772888.pdf
    • http://files.worldofmicrobiology.com/uploads/1/3/1/4/131406321/9875011.pdf
    • http://files.delgadorivera.com/uploads/1/3/1/4/131453560/vosuneripisasax.pdf
    • http://files.macombcountyretirees.com/uploads/1/3/0/7/130775786/tidenivi.pdf
    • http://files.theaccelerationproject.org/uploads/1/3/0/7/130740175/zewusutolo.pdf
    • https://cdn.shopify.com/s/files/1/0431/2186/8960/files/64768510309.pdf
    • https://cdn.shopify.com/s/files/1/0440/6404/7269/files/34569594708.pdf
    • https://cdn.shopify.com/s/files/1/0430/0380/5847/files/51535268053.pdf
    • https://cdn.shopify.com/s/files/1/0436/7309/2246/files/20393176911.pdf
    • https://cdn.shopify.com/s/files/1/0437/2843/7399/files/54695091153.pdf
    • https://cdn.shopify.com/s/files/1/0441/0087/8488/files/kexiditegekaruva.pdf
    • https://cdn.shopify.com/s/files/1/0428/1873/2191/files/sixipuvexo.pdf
    • https://cdn.shopify.com/s/files/1/0441/1867/1512/files/musedenarowawejig.pdf
    • https://cdn.shopify.com/s/files/1/0437/8502/7745/files/upsssc_tubewell_operator_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0430/4030/9402/files/2421945359.pdf
    • https://cdn.shopify.com/s/files/1/0438/0996/4192/files/lusunosolugopuxopibal.pdf
    • https://cdn.shopify.com/s/files/1/0432/3131/4077/files/concrete_batching_plant_operation.pdf
    • https://cdn.shopify.com/s/files/1/0433/1238/2117/files/nokafidomo.pdf
    • https://cdn.shopify.com/s/files/1/0437/2227/7032/files/95754692612.pdf
    • https://cdn.shopify.com/s/files/1/0434/4414/2245/files/bimesikizop.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_off00008a8d.bin
c478403a2abb0b6dff583986f5160a48274d205f4235e0c164592fb6527070a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A8D 5152 bytes
font_01_sfnt_off00009c1d.bin
9835ebc954afae9027b683f76f79583c4f41159578423967a688aa99ca52882b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C1D 10632 bytes

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