Malicious PDF — malware analysis report

Static analysis result for SHA-256 750950f2f649dcea…

MALICIOUS

PDF

41.0 KB Created: 2020-08-08 12:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbdefd32094fa9768f09d8b85962c9b4 SHA-1: 72a3bc59b35b77bf7ff90232c070648ad3b8a241 SHA-256: 750950f2f649dceadcd30ad5298dbd42db4d00d820625e1f045b4670a46b1f85
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, many of which point to external PDF files hosted on various domains, suggesting a link farm or SEO poisoning attempt. One prominent link, https://ttraff.ru/pify?keyword=astm+a53+grade+b+pdf, is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The presence of these links indicates an attempt to lure users to potentially harmful 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.ru/pify?keyword=astm+a53+grade+b+pdf
    • http://files.chebeaguerec.com/uploads/1/3/0/7/130739646/8288100.pdf
    • http://files.northernfrightsfestival.com/uploads/1/3/2/6/132682883/3db695d8550.pdf
    • http://jubixu.samuelbloch.fr/uploads/1/3/1/1/131164250/e14e16e48eb9c1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5948/6626/files/onion_and_calamansi_extract_as_cockroach_killer.pdf
    • https://cdn.shopify.com/s/files/1/0428/4930/4732/files/20648058819.pdf
    • https://cdn.shopify.com/s/files/1/0435/1298/7802/files/godutekapomuzipujoxeraseg.pdf
    • https://cdn.shopify.com/s/files/1/0437/1821/3797/files/fataxesakivawuwojimuwobim.pdf
    • https://cdn.shopify.com/s/files/1/0430/6567/1833/files/tutorisejov.pdf
    • https://cdn.shopify.com/s/files/1/0429/2683/3823/files/mozeragelix.pdf
    • https://cdn.shopify.com/s/files/1/0431/9812/0094/files/1496208717.pdf
    • https://cdn.shopify.com/s/files/1/0439/9644/6878/files/cxl_roman_numerals.pdf
    • https://cdn.shopify.com/s/files/1/0437/9105/7058/files/que_es_un_bosque_tropical.pdf
    • https://cdn.shopify.com/s/files/1/0434/7949/8918/files/tuzabizikofatibupa.pdf
    • https://cdn.shopify.com/s/files/1/0435/6882/4488/files/15123097714.pdf
    • https://cdn.shopify.com/s/files/1/0431/1223/5159/files/zamototenixubogifi.pdf
    • https://cdn.shopify.com/s/files/1/0434/1438/8888/files/kiterepidopiv.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a3a.bin
d86cc0f408f4d6b6169ff550ba7ffd290ff5e5f07a85f8b0f8fbcf2d5a631bea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A3A 5744 bytes
font_01_sfnt_off00006dae.bin
bb9048069f999451353e5c36ba5481c66e2fb2a3b7da51e3381a5fef120fc434		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DAE 13484 bytes

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