Malicious PDF — malware analysis report

Static analysis result for SHA-256 363948d53ccd86e1…

MALICIOUS

PDF

43.4 KB Created: 2020-08-22 01:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0b3a5ed8c4e8e38fdb171d880a6d9943 SHA-1: 5beada4557b8a82fcec097f2313faea844ce8b7a SHA-256: 363948d53ccd86e1ead677fc6c32599430f4bd9edb4dc0633b74ced2fde30752
152 Risk Score

Malware Insights

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

The PDF document was flagged by a machine learning classifier as malicious. It contains a significant number of embedded links, with one pointing to a known malicious redirector infrastructure at 'ttraff.ru'. The presence of a link farm suggests an attempt to distribute malicious content or phish users. No scripts were extracted from this sample.

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=fallout+4+bunker+hill+inform+railroad
    • http://files.rina-bansuri.com/uploads/1/3/1/3/131379923/1170570.pdf
    • https://cdn.shopify.com/s/files/1/0428/2312/3100/files/ruvojawarixakel.pdf
    • https://cdn.shopify.com/s/files/1/0433/2748/8168/files/bilidetasez.pdf
    • https://cdn.shopify.com/s/files/1/0438/5295/5810/files/tu_cerebro_creativo_shelley_carson_descargar.pdf
    • https://cdn.shopify.com/s/files/1/0434/7920/3992/files/26168451568.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/advanced_search_engine_optimization.pdf
    • https://cdn.shopify.com/s/files/1/0428/7338/9223/files/metozewukitotodoloduviki.pdf
    • https://cdn.shopify.com/s/files/1/0428/7142/3135/files/movadasowonamopitisu.pdf
    • https://cdn.shopify.com/s/files/1/0443/9130/1286/files/bsc_math_notes_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/3349/3658/files/extra_utilities_2_trash_chest.pdf
    • https://cdn.shopify.com/s/files/1/0433/4272/5275/files/osrs_abyss_miniquest.pdf
    • https://cdn.shopify.com/s/files/1/0432/6513/0658/files/widakugesitosalinozidope.pdf
    • https://cdn.shopify.com/s/files/1/0430/1642/1529/files/45268575782.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_off00006c62.bin
a3fc7e8742768bf0b68b8d4e7bd06d77835fb4fcb42e78d2524f4eb275c71296
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C62 5216 bytes
font_01_sfnt_off00007df3.bin
3ec9bad0d3fdc04d905c2d31bf642efe1059622be4545437c219e392812ddbae
pdf-font-stream PDF embedded font (sfnt) at offset 0x7DF3 10112 bytes