Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef7f8be52992160c…

MALICIOUS

PDF

43.1 KB Created: 2020-08-20 19:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9a34c08146c74e15430e5b3cc9ca8e2e SHA-1: e9932e73a4dd77c9531ef78771f0ba2a1366f4ab SHA-256: ef7f8be52992160ce4c12edccc93a45691170b67149741790639048de03e9559
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a malicious redirector. The document body, though partially corrupted, contains text related to "evaluating functions coloring worksheet answers" and includes the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of a malicious redirector link and a link farm indicates an attempt to drive traffic to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=evaluating+functions+coloring+worksheet+answers
    • http://files.edbjohnson.com/uploads/1/3/1/4/131406286/3f1d36.pdf
    • https://cdn.shopify.com/s/files/1/0429/2830/8387/files/89825882628.pdf
    • https://cdn.shopify.com/s/files/1/0438/4676/2656/files/lelelew.pdf
    • https://cdn.shopify.com/s/files/1/0437/2021/2645/files/71741757271.pdf
    • https://cdn.shopify.com/s/files/1/0434/3011/7542/files/36665207195.pdf
    • https://cdn.shopify.com/s/files/1/0431/7275/7670/files/solataxizalazumevisuv.pdf
    • https://cdn.shopify.com/s/files/1/0427/7737/8972/files/99436715044.pdf
    • https://cdn.shopify.com/s/files/1/0448/5467/3569/files/driver_wifi_acer_aspire_4752z.pdf
    • https://cdn.shopify.com/s/files/1/0437/2345/6661/files/regib.pdf
    • https://cdn.shopify.com/s/files/1/0435/5706/0769/files/bonus_form_d.pdf
    • https://cdn.shopify.com/s/files/1/0435/2717/6344/files/rakisegog.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c81.bin
1c3c4ac17e5092db136e23538e016bac140098750ced078805854163175de8b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C81 5200 bytes
font_01_sfnt_off00006e45.bin
5166c74a0b2b1b9cbb9a6790dc98e7d32773a11551e028a2e2eac494292c553f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E45 10296 bytes
font_02_sfnt_off00009152.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9152 4324 bytes

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