Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4aac88dbaea2b37…

MALICIOUS

PDF

44.7 KB Created: 2020-08-12 20:53:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30c7c36fbc86d6305a2248b6ee4cf6f7 SHA-1: 2da10758074c5f238d9fab03b14c542693418500 SHA-256: c4aac88dbaea2b37fd4821d3aef1e9d47c7d24d590481deb4edd9aaf019a0ae9
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF contains a large number of embedded links, many pointing to external PDF files, which is characteristic of a link farm designed for SEO manipulation. One of the primary links, 'https://ttraff.ru/pify?keyword=aristotle+philosophy+of+self+pdf', is flagged as a malicious redirector. This suggests the document's purpose is to drive traffic to malicious sites, likely for phishing or malware distribution, rather than providing legitimate content.

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=aristotle+philosophy+of+self+pdf
    • http://files.farmandgardencamp.org/uploads/1/3/2/7/132741109/8b88f4c6c.pdf
    • http://files.praktische-philosophie.org/uploads/1/3/0/8/130814226/8386625.pdf
    • http://files.hungerfightersoregon.org/uploads/1/3/1/4/131409693/787779.pdf
    • http://files.whitecubepicturelab.com/uploads/1/3/2/8/132814071/948d6bc.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/darokijo.pdf
    • https://cdn.shopify.com/s/files/1/0434/0029/8648/files/45768200824.pdf
    • https://cdn.shopify.com/s/files/1/0432/1283/2931/files/36468205470.pdf
    • https://cdn.shopify.com/s/files/1/0429/6713/8470/files/bezobutiliragimodigikab.pdf
    • https://cdn.shopify.com/s/files/1/0427/6705/7063/files/jezotegukonavufesexipo.pdf
    • https://cdn.shopify.com/s/files/1/0451/1848/8741/files/2278313419.pdf
    • https://cdn.shopify.com/s/files/1/0432/4638/7362/files/85224788939.pdf
    • https://cdn.shopify.com/s/files/1/0428/0143/0695/files/pegezezud.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/muzoguganava.pdf
    • https://cdn.shopify.com/s/files/1/0430/9532/6887/files/68362452411.pdf
    • https://cdn.shopify.com/s/files/1/0432/0490/3073/files/polugovis.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_off0000713a.bin
93f1c8efa2d535df9e6f35fa37efde22d2b0ebe937494e7a43b9a8d236ef1ff5
pdf-font-stream PDF embedded font (sfnt) at offset 0x713A 5012 bytes
font_01_sfnt_off00008244.bin
2eaef9f3c89c855e64cdb8ed2c475b60f82431a092e667371f89064a2220c6c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x8244 10764 bytes