Malicious PDF — malware analysis report

Static analysis result for SHA-256 78322e4011e1fbf2…

MALICIOUS

PDF

48.1 KB Created: 2020-08-07 18:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1177c8631ceb64e31f9bd5b1a0ba5657 SHA-1: 09b4c3aadc1bbf98472a1ae7c31e7e0943d5381d SHA-256: 78322e4011e1fbf23c1e798cc807480b94828f11dbde1c9bd754da5892cb872d
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to known malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains URLs that are part of a link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The ML_NYX_PDF_MALICIOUS heuristic further supports the malicious classification.

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=evento+cerebrovascular+isquemico+y+hemorragico+pdf
    • http://files.judithmary.com/uploads/1/3/0/9/130970001/4277096.pdf
    • http://files.nrareservations.com/uploads/1/3/1/8/131871850/d1c165b2f16.pdf
    • http://xatas.gitaarlesdamwoude.nl/uploads/1/3/1/6/131606490/a611d04b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/6277/9295/files/zidanerobetavigolim.pdf
    • https://cdn.shopify.com/s/files/1/0432/1827/2423/files/mw3_mod_xbox_360.pdf
    • https://cdn.shopify.com/s/files/1/0428/2476/1507/files/92719424616.pdf
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/lilitujijonuj.pdf
    • https://cdn.shopify.com/s/files/1/0428/7227/5103/files/sijusu.pdf
    • https://cdn.shopify.com/s/files/1/0427/7973/8278/files/mawaxoguwu.pdf
    • https://cdn.shopify.com/s/files/1/0434/0708/1622/files/string_to_int_c.pdf
    • https://cdn.shopify.com/s/files/1/0430/9060/8285/files/dojamisapik.pdf
    • https://cdn.shopify.com/s/files/1/0429/0917/1879/files/guxokelamolela.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/oblicza_geografii_atmosfera_sprawdzian.pdf
    • https://cdn.shopify.com/s/files/1/0427/4877/2508/files/93500959477.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_off0000756b.bin
6e130dabec0d78e8caa6fe44cf400ab74414cefcabc4022533b3737b3f9cf212
pdf-font-stream PDF embedded font (sfnt) at offset 0x756B 5952 bytes
font_01_sfnt_off0000898b.bin
76ec1c8f53f172dcd36118362edf36b284c7c91c5c0162be5bb048b3ed9d8a2c
pdf-font-stream PDF embedded font (sfnt) at offset 0x898B 13056 bytes