Malicious PDF — malware analysis report

Static analysis result for SHA-256 4710d8a29ac26fc5…

MALICIOUS

PDF

42.0 KB Created: 2020-08-07 10:13:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 143628885f294ec43610c32e4e566333 SHA-1: 72c60830d2ff6b29190915f8d0b4b363dda803ac SHA-256: 4710d8a29ac26fc5a79ee316035302f87ad83dd86c2170827647d38ebba0037f
152 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded URLs, characteristic of a link farm designed to obscure malicious destinations. The primary malicious URL, https://ttraff.ru/pify?keyword=lsat+logical+reasoning+sample+questions+and+answers+pdf, is identified as a redirector to known malicious infrastructure. The document body, though heavily obfuscated, contains references to the malicious URL and appears to be a lure for 'lsat logical reasoning sample questions and answers 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.ru/pify?keyword=lsat+logical+reasoning+sample+questions+and+answers+pdf
    • http://files.thehealingartscenterofrichmond.com/uploads/1/3/0/7/130775350/wupererowo-nufeniwum.pdf
    • http://files.chemometricsufrn.org/uploads/1/3/1/4/131406269/5329357.pdf
    • http://files.916getfit.com/uploads/1/3/0/8/130874023/4015823.pdf
    • https://cdn.shopify.com/s/files/1/0437/7637/6983/files/osrs_dragon_boots.pdf
    • https://cdn.shopify.com/s/files/1/0429/9679/3503/files/82479381884.pdf
    • https://cdn.shopify.com/s/files/1/0428/5654/6467/files/baxefisazij.pdf
    • https://cdn.shopify.com/s/files/1/0430/2517/0595/files/74627543088.pdf
    • https://cdn.shopify.com/s/files/1/0437/6369/5770/files/tenapuledanagebamajokeraw.pdf
    • https://cdn.shopify.com/s/files/1/0436/9340/8409/files/gta_v_cheats_xbox_360.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/48465164240.pdf
    • https://cdn.shopify.com/s/files/1/0432/9802/9733/files/51386976831.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/2919698821.pdf
    • https://cdn.shopify.com/s/files/1/0435/7141/3160/files/the_whole_earth_catalog.pdf
    • https://cdn.shopify.com/s/files/1/0435/9494/0573/files/puvatuxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31082235151.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_off00006381.bin
038e7f24b13245a02f690da3f73cda6b50bcb4fef08b2f757e6ef761f6cbb622
pdf-font-stream PDF embedded font (sfnt) at offset 0x6381 5636 bytes
font_01_sfnt_off000076a3.bin
83d9d26f9f3e7c203c3762f48c32de87fad8c95c54afbec766eb9a795e17e349
pdf-font-stream PDF embedded font (sfnt) at offset 0x76A3 10500 bytes