Malicious PDF — malware analysis report

Static analysis result for SHA-256 90582b2e958e5137…

MALICIOUS

PDF

46.5 KB Created: 2020-08-14 02:28:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa1cc5fe177a00022dac70944705274a SHA-1: 325654cabd1282c904f8b8b5d3b4930157fad42a SHA-256: 90582b2e958e5137f42e5babadda11f24875ba28721f8e828d5e05f51991d4f6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/pify?keyword=car+rental+application+form+pdf'. This URL, combined with the PDF structure and numerous embedded links to external PDFs, suggests a phishing or malware distribution attempt. The document body, though heavily corrupted, contains text related to a 'car rental application form', reinforcing the lure. The ML classifier also strongly flagged this PDF as malicious.

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=car+rental+application+form+pdf
    • http://xefulugog.emilyjaneart.co.uk/uploads/1/3/0/8/130814328/4524714.pdf
    • http://files.madisonmedium.com/uploads/1/3/2/7/132710627/6161071.pdf
    • http://files.cpr-instructorclasses.com/uploads/1/3/1/3/131380295/5617529.pdf
    • http://fexur.coipuganda.org/uploads/1/3/2/3/132303027/4854596.pdf
    • http://zipez.windowproductsinc.com/uploads/1/3/2/6/132682883/gupituxenopakupopi.pdf
    • https://cdn.shopify.com/s/files/1/0432/3137/9618/files/xusepod.pdf
    • https://cdn.shopify.com/s/files/1/0431/4929/5776/files/2120903490.pdf
    • https://cdn.shopify.com/s/files/1/0430/1609/3849/files/31284747862.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1120/files/bulova_marine_star_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29331550606.pdf
    • https://cdn.shopify.com/s/files/1/0434/0586/9213/files/comparing_and_ordering_decimals_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/7713/1683/files/alphabet_activity_book.pdf
    • https://cdn.shopify.com/s/files/1/0429/0461/7119/files/98652957023.pdf
    • https://cdn.shopify.com/s/files/1/0440/8393/7432/files/72074099783.pdf
    • https://cdn.shopify.com/s/files/1/0430/7389/6602/files/70834106048.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/jegatakufiritejat.pdf
    • https://cdn.shopify.com/s/files/1/0445/5782/8260/files/circle_of_willis.pdf
    • https://cdn.shopify.com/s/files/1/0431/6846/5053/files/variwujutixigijaruranap.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_off00007834.bin
b7388901835434c5fdaf61ecac7f3e25a43294f5d343bbcb50846ff4122dfb53		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7834 5028 bytes
font_01_sfnt_off00008932.bin
6c6e497fbe0c977815edc0f53f01dcb1134c62b7f91c83f743ff40c3021b6e0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8932 10304 bytes

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