Malicious PDF — malware analysis report

Static analysis result for SHA-256 593d4f9dda3f76d6…

MALICIOUS

PDF

51.7 KB Created: 2020-08-03 14:52:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c665fc296997a252b8ee5da073047377 SHA-1: 271f99111f3b9ed495d43c7a491902ac0f6956c6 SHA-256: 593d4f9dda3f76d6f070bc26c1474c1305d5997495c1e3049a427dc9f93c9502
152 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector (ttraff.com). The document body, though heavily obfuscated, includes the same URL and text related to 'assessment testing and evaluation in teacher education pdf', suggesting a lure. The presence of a link farm heuristic further indicates malicious intent to distribute links. No scripts were extracted, but the primary attack vector appears to be directing users to malicious infrastructure via embedded links.

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=assessment+testing+and+evaluation+in+teacher+education+pdf
    • http://jeverun.mcmurraychiropractic.com/uploads/1/3/0/7/130775734/4312458.pdf
    • http://files.tamiesfurniture.com/uploads/1/3/0/7/130775261/f8d251c0e0b.pdf
    • http://files.decaledinc.com/uploads/1/3/1/6/131606011/zufujidiruwafuzab.pdf
    • https://cdn.shopify.com/s/files/1/0436/9409/6539/files/alimentation_dfinition.pdf
    • https://cdn.shopify.com/s/files/1/0434/4581/3414/files/gisov.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/29878061118.pdf
    • https://cdn.shopify.com/s/files/1/0431/7623/1063/files/jozasezek.pdf
    • https://cdn.shopify.com/s/files/1/0430/0511/6575/files/somuzinanu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4185/7448/files/bevotifot.pdf
    • https://cdn.shopify.com/s/files/1/0430/5443/2410/files/tituxukowukezinolov.pdf
    • https://cdn.shopify.com/s/files/1/0429/8476/7641/files/7892029045.pdf
    • https://cdn.shopify.com/s/files/1/0432/1119/4525/files/jafisiwirolov.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94448736580.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/38743570217.pdf
    • https://cdn.shopify.com/s/files/1/0436/2849/5001/files/2016_nissan_rogue_owner_s_manual.pdf
    • https://cdn.shopify.com/s/files/1/0428/0591/9903/files/19673668783.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_off00007cd5.bin
1f577d363a436f3b89a7afa3f299d21d283d005caa6bbdeb89d88e7e01569125		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CD5 5500 bytes
font_01_sfnt_off00008f58.bin
ca0b5bd242ad89b4b3e6a18313f6db2122e662029ffee1d8d8d7b3ffc368aacd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F58 10416 bytes
font_02_sfnt_off0000b2e8.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2E8 4324 bytes

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