Malicious PDF — malware analysis report

Static analysis result for SHA-256 86270dc81f493ef7…

MALICIOUS

PDF

41.8 KB Created: 2020-08-18 23:48:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3b65428c9be49c1e95f68082b557f3f9 SHA-1: bfcc79fed2051c099864561808af4983fd2dfc1e SHA-256: 86270dc81f493ef7073c0c4375623c2c7295b2b433e723a8c44a4137ba94d381
154 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, which is a common tactic for distributing malware. The document body also contains the same URL, suggesting an attempt to trick users into clicking it for a supposed free software download. The presence of numerous external links, many pointing to PDF files, indicates a link farm or SEO poisoning attempt to drive traffic to malicious infrastructure.

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=autocad+free++for+mac+os+x
    • http://files.sampayton.com/uploads/1/3/1/1/131163540/dbf14b84a.pdf
    • http://files.reclaimedtreasuresaz.com/uploads/1/3/0/7/130738779/kalubir-bewuzo.pdf
    • http://files.iloveartstudio.com/uploads/1/3/1/4/131483318/bidazaliko.pdf
    • http://files.pineywoodsaudubonsocietytx.org/uploads/1/3/1/4/131437477/munorepuxomu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/4467/3448/files/98308622119.pdf
    • https://cdn.shopify.com/s/files/1/0428/6968/6431/files/dopoworilijilukanozir.pdf
    • https://cdn.shopify.com/s/files/1/0433/6641/6549/files/pitew.pdf
    • https://cdn.shopify.com/s/files/1/0430/4617/4877/files/dreamscene_window_7.pdf
    • https://cdn.shopify.com/s/files/1/0427/9966/1223/files/70509456457.pdf
    • https://cdn.shopify.com/s/files/1/0430/0609/9605/files/living_religions_9th_edition_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/5190/8249/files/14096091578.pdf
    • https://cdn.shopify.com/s/files/1/0428/4160/4263/files/52999863568.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_off00006738.bin
44612adb0d2c6c0748743bbc5763814452a0f7778067dd17bb90248dbe74f800
pdf-font-stream PDF embedded font (sfnt) at offset 0x6738 5192 bytes
font_01_sfnt_off000078c6.bin
44ff63fafd1ee64de2e4ac0a285b04c55011c9a64ea3f25f53d7980e6018afc8
pdf-font-stream PDF embedded font (sfnt) at offset 0x78C6 9824 bytes