Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56db75df1622103…

MALICIOUS

PDF

51.1 KB Created: 2020-07-31 14:21:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1cae2a552c7e414bed1171bae6728d69 SHA-1: d7872d51a32681e1edb03aa600bd00f68dca0d87 SHA-256: d56db75df1622103afb73ec966771d80aea0ad66f30804955cf856548a747921
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it features a PDF link farm heuristic, indicating a large number of outbound links, with the primary one leading to a Shopify domain. The ML classifier also strongly flagged this PDF as malicious. The embedded document body text is heavily obfuscated and unreadable, but the presence of the malicious redirector link is the primary indicator of malicious intent, likely serving as a lure for further malicious activity.

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=analysis+essay+sample+pdf
    • http://files.crescentsecurities.in/uploads/1/3/0/9/130969986/mojulu-zisuwi.pdf
    • http://files.coboaz.com/uploads/1/3/2/7/132741169/dinanibiwidulor.pdf
    • http://files.theclinicnextdoor.com/uploads/1/3/1/3/131398419/4077ddca5.pdf
    • https://cdn.shopify.com/s/files/1/0431/0610/7552/files/97182769569.pdf
    • https://cdn.shopify.com/s/files/1/0433/8240/7335/files/93801619416.pdf
    • https://cdn.shopify.com/s/files/1/0433/0654/9406/files/tidodegafaki.pdf
    • https://cdn.shopify.com/s/files/1/0430/6426/2818/files/59742475044.pdf
    • https://cdn.shopify.com/s/files/1/0432/3121/5780/files/ripedibagozadarigiviri.pdf
    • https://cdn.shopify.com/s/files/1/0433/2955/2552/files/samefuwumaxejupositaje.pdf
    • https://cdn.shopify.com/s/files/1/0429/9961/1553/files/fesixajosesagafupapagofov.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/mitabuvinodoweruxoge.pdf
    • https://cdn.shopify.com/s/files/1/0434/7399/3890/files/64647513780.pdf
    • https://cdn.shopify.com/s/files/1/0437/6051/7269/files/joxafinibefoxesituxiwuli.pdf
    • https://cdn.shopify.com/s/files/1/0429/7241/4106/files/tanikabimu.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_off00007c07.bin
792e288023e4fbe73a0351c4e4cf94c19217598e688914c0413f09f13c1160d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C07 6568 bytes
font_01_sfnt_off00008c54.bin
960ac12413bd4b6644e8a561282509b6a3525ab7815c80d1f0b075ee49c75f11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C54 4780 bytes
font_02_sfnt_off00009c7b.bin
7c6bd34f80c66d7fbfce96cb2de6ea8fbe2437f0e958287d5e4d8c8f0fb514d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C7B 10088 bytes

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