Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc56b3249e3d254…

MALICIOUS

PDF

43.0 KB Created: 2020-08-07 10:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 840f8dd28c5eee0cfe736becd2456509 SHA-1: cc653217b88d8f0f3381331563225ef144f31d15 SHA-256: 5fc56b3249e3d2542d1cb5466af3226d70914c009858f1db208e97028738c77f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one identified as a malicious redirector. The document body, though partially corrupted, includes the URL 'https://ttraff.cc/pify?keyword=dissection+of+cockroach+digestive+system+pdf', suggesting a lure to a malicious site. The presence of a large number of external PDF links further indicates a link farm or redirection scheme.

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=dissection+of+cockroach+digestive+system+pdf
    • http://tepoxi.caelart.com/uploads/1/3/1/0/131070420/63efe03375.pdf
    • http://files.bridington.com/uploads/1/3/1/4/131453429/muvojiz_xobodudiboteva_vodikekupafimir_bakisuko.pdf
    • http://files.oceanwisejourneys.com/uploads/1/3/0/7/130740517/vafetuwiza-gifawevaw-pedurojuva-fexevesomoti.pdf
    • http://files.kallerasinkangas.com/uploads/1/3/0/8/130874317/2793704.pdf
    • http://files.dejanstojanovic.info/uploads/1/3/1/1/131164314/7519093.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7738/6911/files/83193351110.pdf
    • https://cdn.shopify.com/s/files/1/0434/9391/6837/files/22779472757.pdf
    • https://cdn.shopify.com/s/files/1/0429/3420/6631/files/xivusigej.pdf
    • https://cdn.shopify.com/s/files/1/0450/7333/4424/files/treatment_of_acute_myocardial_infarction.pdf
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/kaxovegevavilonumuge.pdf
    • https://cdn.shopify.com/s/files/1/0433/7899/9446/files/51184473752.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5080/files/39098650631.pdf
    • https://cdn.shopify.com/s/files/1/0434/5993/6421/files/86827939081.pdf
    • https://cdn.shopify.com/s/files/1/0437/9358/0189/files/nesob.pdf
    • https://cdn.shopify.com/s/files/1/0435/9602/1919/files/pepobi.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_off0000688f.bin
b5b999878031e30a01c8d2e4e9e7ac6e1107b11e5d62a37bba80b496683dccc9
pdf-font-stream PDF embedded font (sfnt) at offset 0x688F 5760 bytes
font_01_sfnt_off00007c23.bin
f51ead134d60243063d2347898dbc7faf8552a947f50e91b8ff5b8e16ae06999
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C23 10208 bytes