Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc0c9e8328f7d1e…

MALICIOUS

PDF

36.2 KB Created: 2020-08-19 00:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 144576d15dfff8dbf1cb941ceb2e4f21 SHA-1: d69fd036ed622c162ad06434f53587bfb2de14f3 SHA-256: afc0c9e8328f7d1ebc18ba3f49849413d1eb746266bde3b73d30159bc4310acc
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to URLs that likely serve as lures or downloaders for further malicious activity. The primary attack pattern involves leveraging these links to redirect users to malicious infrastructure.

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=schindler+list+music+sheet
    • http://files.thehumblehostess.com/uploads/1/3/0/7/130739022/dagisiwemu-jelenune-xakis.pdf
    • http://faluve.joebarkerart.com/uploads/1/3/1/4/131453574/6102401.pdf
    • http://files.totallylinkedin.com/uploads/1/3/0/7/130739239/nubiziwenetob.pdf
    • https://cdn.shopify.com/s/files/1/0431/6728/5410/files/retotofilawedi.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65039204935.pdf
    • https://cdn.shopify.com/s/files/1/0431/6237/0210/files/50361809802.pdf
    • https://cdn.shopify.com/s/files/1/0429/4826/4089/files/detotokutimemug.pdf
    • https://cdn.shopify.com/s/files/1/0428/8181/0595/files/37222726281.pdf
    • https://cdn.shopify.com/s/files/1/0439/0918/5691/files/74792869041.pdf
    • https://cdn.shopify.com/s/files/1/0428/3075/8044/files/41178210581.pdf
    • https://cdn.shopify.com/s/files/1/0439/3605/5454/files/exercice_corrig_sur_barycentre.pdf
    • https://cdn.shopify.com/s/files/1/0433/8771/5742/files/33139041420.pdf
    • https://cdn.shopify.com/s/files/1/0433/6582/6719/files/restaurant_banner_design_free_template.pdf
    • https://cdn.shopify.com/s/files/1/0434/1111/2092/files/55559130527.pdf
    • https://cdn.shopify.com/s/files/1/0431/8298/1281/files/25796896229.pdf
    • https://cdn.shopify.com/s/files/1/0429/1703/6198/files/wepujuzox.pdf
    • https://cdn.shopify.com/s/files/1/0431/9245/1232/files/6071778387.pdf
    • https://cdn.shopify.com/s/files/1/0428/2603/9463/files/zanes.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_off00004e95.bin
4194d30cb8c1c9795ad343ee49c1d1b2bd891a39397c8aebfd7d43ba5c2f496a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E95 5072 bytes
font_01_sfnt_off00005f96.bin
f06acc31453f6cd65b0b22009bb40623ed5e6652515c5a09b580c4e895190b65		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F96 10616 bytes

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