Malicious PDF — malware analysis report

Static analysis result for SHA-256 b158b8c4cf554364…

MALICIOUS

PDF

41.6 KB Created: 2020-08-18 14:10:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 394620f3fb980e79e989a329ce893305 SHA-1: f8c242dbae17c33477b341063e753cd212ee0596 SHA-256: b158b8c4cf55436441ea5bc02770a5078f6662b34353d1bf8e4b947bd8f1e872
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF document contains a link farm designed to appear as a report on obesity, physical activity, and diet. This content is a lure to encourage users to click the embedded URL, which leads to the malicious redirector 'https://ttraff.com/pify?keyword=obesity+physical+activity+and+diet+report'. The ML classifier strongly indicated maliciousness, and the PDF structure includes numerous links to external resources, many hosted on Shopify, likely to obscure the malicious redirector.

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.com/pify?keyword=obesity+physical+activity+and+diet+report
    • http://zulumun.jerichotownlibraryvt.org/uploads/1/3/0/7/130739602/buburepogeb.pdf
    • http://files.astaratours.com/uploads/1/3/1/4/131409024/biwixiruwekorupekus.pdf
    • http://sonenimo.kaitlynkerrphotography.com/uploads/1/3/0/7/130775354/ff5019c9.pdf
    • https://cdn.shopify.com/s/files/1/0435/5378/3957/files/33759439958.pdf
    • https://cdn.shopify.com/s/files/1/0437/2371/8824/files/18621003987.pdf
    • https://cdn.shopify.com/s/files/1/0430/0996/6239/files/fomosixuruxufe.pdf
    • https://cdn.shopify.com/s/files/1/0430/9064/1045/files/26781030156.pdf
    • https://cdn.shopify.com/s/files/1/0434/4178/2946/files/97082287689.pdf
    • https://cdn.shopify.com/s/files/1/0430/9896/4117/files/setup_local_host.pdf
    • https://cdn.shopify.com/s/files/1/0427/7266/0390/files/65932911834.pdf
    • https://cdn.shopify.com/s/files/1/0429/5009/9107/files/el_aire_que_respira_brittainy_c_cherry_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0437/4082/3706/files/negative_reinforcement_in_the_elementary_classroom.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_off0000647b.bin
2c15255fbb458a3b79870f679da9315dfcae6560fba5928fa93a36b610e11bf5
pdf-font-stream PDF embedded font (sfnt) at offset 0x647B 5488 bytes
font_01_sfnt_off00007713.bin
429c701af1c92f7faa9b62d2a39f20c608ad92c89a8b2fc3cfdfcbbc2e8ef349
pdf-font-stream PDF embedded font (sfnt) at offset 0x7713 10088 bytes