Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7451ed772335685…

MALICIOUS

PDF

44.3 KB Created: 2020-08-14 14:26:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ceb9715a026d7f8ddab7379e089d83e4 SHA-1: a53a894c517ea9adf3c8167eb2346ef2c541c001 SHA-256: e7451ed772335685d5c9b1f2158d575295c38bf89f002f837a1b444fd9f7e32d
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 PDF files hosted on various domains, suggesting a link farm or redirection strategy. One critical heuristic identified a link to a known malicious redirector, ttraff.cc, which is likely the primary malicious payload delivery mechanism. The document body, though heavily obfuscated, contains the target URL, reinforcing the malicious intent.

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=lsu+gymnastics+injury+report
    • http://files.jingergustafson.com/uploads/1/3/1/4/131453402/7719565.pdf
    • http://fozora.holmescreekbc.com/uploads/1/3/2/3/132303189/niwugarewofewujaze.pdf
    • http://dimojutun.sleepytownpress.com/uploads/1/3/1/6/131636612/jogafujop_bulej_mixamosutalixib.pdf
    • http://files.2skypattaya.com/uploads/1/3/2/6/132682204/82930d1a8.pdf
    • http://files.artsinhealth.wales/uploads/1/3/1/4/131437983/zobalore_vufixomude_meweko.pdf
    • https://cdn.shopify.com/s/files/1/0435/3123/9588/files/40205123465.pdf
    • https://cdn.shopify.com/s/files/1/0431/7963/8942/files/fatalazugegomizaxi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7899/1520/files/22574730391.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/5866669006.pdf
    • https://cdn.shopify.com/s/files/1/0435/1010/4228/files/27571104472.pdf
    • https://cdn.shopify.com/s/files/1/0437/6113/9861/files/20056478171.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8806/files/97298996333.pdf
    • https://cdn.shopify.com/s/files/1/0434/4768/1191/files/73226685449.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lufixupiz.pdf
    • https://cdn.shopify.com/s/files/1/0429/6212/4959/files/fimenetepavup.pdf
    • https://cdn.shopify.com/s/files/1/0434/1009/6284/files/my_large_scale.pdf
    • https://cdn.shopify.com/s/files/1/0433/9168/0673/files/apathy_evaluation_scale_informant.pdf
    • https://cdn.shopify.com/s/files/1/0433/3626/9983/files/64251493324.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_off00006ef8.bin
57faa6c1bf77895b0fcd7d08b9dafbe9a7bfe0462986a4effbc28e8f9f4a45e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EF8 5340 bytes
font_01_sfnt_off00008117.bin
9eb55891cced81e8bce5be89f2a65e89049f97a5df8a24671ca7d31d4281a5f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8117 10204 bytes

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