Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb66b527ab40d780…

MALICIOUS

PDF

45.2 KB Created: 2020-08-05 13:41:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c55f6cff955026346610fe1d307c1e46 SHA-1: e4e790c94c29d86cdaa1983f8eb4b1d1da011f59 SHA-256: eb66b527ab40d7802d02b3a0a1b1bcfc74b665eccdd7f6fa82bf8fd343c258a8
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a large number of external PDF links, indicating a link farm. The ML classifier also strongly indicated maliciousness. The document body contains the URL https://ttraff.cc/pify?keyword=absolute+phrase+worksheet+pdf, which is likely used to redirect users to malicious content. The presence of numerous Shopify-hosted PDF links suggests an attempt to disguise or distribute the malicious content.

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=absolute+phrase+worksheet+pdf
    • http://files.koreasda.com/uploads/1/3/0/8/130814003/63b657.pdf
    • http://files.hubertandbelle.com/uploads/1/3/0/8/130873794/6348132.pdf
    • http://files.power-up-potential.com/uploads/1/3/2/6/132682806/1836450.pdf
    • http://files.anchorfloral.com/uploads/1/3/0/7/130776828/makujevuje_fidamilukewaru.pdf
    • http://files.1600charlestonregionalparkway.com/uploads/1/3/0/9/130969498/d2436f4.pdf
    • https://cdn.shopify.com/s/files/1/0430/0396/9689/files/fedipusonoxuxenavowojog.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/95509007145.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/26450283228.pdf
    • https://cdn.shopify.com/s/files/1/0433/4832/8603/files/63215707075.pdf
    • https://cdn.shopify.com/s/files/1/0431/3484/5079/files/53711913610.pdf
    • https://cdn.shopify.com/s/files/1/0428/4815/7859/files/tujefemuduwinifufibiwu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5857/7056/files/linimeravixixuralino.pdf
    • https://cdn.shopify.com/s/files/1/0432/5844/5979/files/21133967035.pdf
    • https://cdn.shopify.com/s/files/1/0430/6599/9511/files/xajobipejugoliduza.pdf
    • https://cdn.shopify.com/s/files/1/0427/6961/2966/files/latejetusazilofapojanu.pdf
    • https://cdn.shopify.com/s/files/1/0430/3909/6986/files/duxiv.pdf
    • https://cdn.shopify.com/s/files/1/0437/0766/2490/files/java_programming_language_for_beginners.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_off0000647c.bin
36f2e148b2f593bfebd8a8f456169c762c6329a710f570e0658325e3289dfc5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x647C 5144 bytes
font_01_sfnt_off00007619.bin
5697209c1589863a2a8302eeb2ff8415c1c5a6ccecaef943b4117503a41f3366		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7619 10476 bytes
font_02_sfnt_off000099f3.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99F3 4324 bytes

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