Malicious PDF — malware analysis report

Static analysis result for SHA-256 af1e4e939d2ad451…

MALICIOUS

PDF

38.0 KB Created: 2020-07-28 04:21:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd1fa387a37703ddf1643a2955cb724b SHA-1: 4d487b36b5379a2cee4fb4f4c4d462a137ecf1e3 SHA-256: af1e4e939d2ad451d7b7bfaf7fe30ff97908fad8ec13588b3bc0ea59105364bb
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, a common tactic for SEO spam and phishing. One critical heuristic identified a link to a known malicious redirector at ttraff.com, which is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, suggests a lure related to educational worksheets, aiming to trick users into clicking the malicious link. The ML classifier strongly supports the malicious nature of this PDF.

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=writing+topic+sentence+worksheets+4th+grade
    • http://files.griperandriperdiscgolf.com/uploads/1/3/0/7/130739906/wilete.pdf
    • http://files.adrianamedinacagan.com/uploads/1/3/1/6/131606844/sevumer.pdf
    • http://files.captivatingcriminalitynetwork.net/uploads/1/3/0/9/130969704/ximorepelutulon.pdf
    • http://files.roppen.com/uploads/1/3/0/7/130738812/falofob_gamaje_gutasizewujasi_sekofaf.pdf
    • http://files.roppen.com/upload
    • https://cdn.shopify.com/s/files/1/0429/9004/3285/files/kajuzaweritokidikik.pdf
    • https://cdn.shopify.com/s/files/1/0429/9915/2799/files/bedisoligoralapi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5631/7091/files/99147086387.pdf
    • https://cdn.shopify.com/s/files/1/0440/7384/4888/files/ruwitumobazegokibeke.pdf
    • https://cdn.shopify.com/s/files/1/0431/8488/1824/files/35520776864.pdf
    • https://cdn.shopify.com/s/files/1/0431/8127/7342/files/lerekikogavizefut.pdf
    • https://cdn.shopify.com/s/files/1/0435/3579/4344/files/tomisosix.pdf
    • https://cdn.shopify.com/s/files/1/0427/6033/9623/files/kafotidividabiteb.pdf
    • https://cdn.shopify.com/s/files/1/0434/8408/6424/files/nevoraludorawiruluxekiwo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5799/5160/files/nukuvudagof.pdf
    • https://cdn.shopify.com/s/files/1/0433/1008/8357/files/21657603939.pdf
    • https://cdn.shopify.com/s/files/1/0428/7633/8335/files/xuzetuwerorolukeno.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_off000057ca.bin
ded71951ebfaa3b7a7cd456bc3026c4c8b626e59177c72863327c965cb1a8c7f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57CA 5348 bytes
font_01_sfnt_off00006a09.bin
690a017a8cb6ff3d8502cf2e377e2970dbd4431779fdff410006897087488b82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A09 9456 bytes

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