Malicious PDF — malware analysis report

Static analysis result for SHA-256 0156ad7c21311d23…

MALICIOUS

PDF

38.1 KB Created: 2020-08-01 22:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 49906140efd4e50617655487377164dd SHA-1: 30b1b0b9caea1b9a8b916d5e2dd0ff79759d0c16 SHA-256: 0156ad7c21311d23d34c4cd97dc6539b7207a5ab21161633626d602cec049b2c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=minecraft+samurai+skin'. Additionally, it exhibits characteristics of a PDF SEO link farm, embedding numerous external PDF links. The ML classifier strongly supports the malicious nature of this file. The primary attack vector appears to be directing users to potentially harmful external 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.cc/pify?keyword=minecraft+samurai+skin
    • http://files.maybellbareket.com/uploads/1/3/1/3/131380485/puvisepegirugon-linugix.pdf
    • http://files.hmdegroot.com/uploads/1/3/0/7/130738850/7c6b73aa809b.pdf
    • http://files.soccerwithoutboundaries.com/uploads/1/3/0/7/130740591/gatojazexafife-suxeja.pdf
    • http://files.steverustmusic.com/uploads/1/3/0/7/130775649/nulikurafape.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/7053/8406/files/59895136821.pdf
    • https://cdn.shopify.com/s/files/1/0432/7066/8453/files/70127741371.pdf
    • https://cdn.shopify.com/s/files/1/0434/2287/5800/files/77176291584.pdf
    • https://cdn.shopify.com/s/files/1/0436/5733/0853/files/84745139914.pdf
    • https://cdn.shopify.com/s/files/1/0432/1142/3902/files/29854146615.pdf
    • https://cdn.shopify.com/s/files/1/0431/5552/1695/files/osrs_nature_spirit.pdf
    • https://cdn.shopify.com/s/files/1/0434/3631/0678/files/juwexuxadikabuni.pdf
    • https://cdn.shopify.com/s/files/1/0433/5458/7288/files/xalofatof.pdf
    • https://cdn.shopify.com/s/files/1/0433/4606/7621/files/zufel.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_off00005809.bin
20fd2973d5b80640ac4823dde5621057ae29d5cba12c0c57a6c8db13643b1650
pdf-font-stream PDF embedded font (sfnt) at offset 0x5809 5064 bytes
font_01_sfnt_off0000693d.bin
5b60c236d0630cc78ec43f8b8667bd19ca759def1ef023622fdf91497b03a7aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x693D 10148 bytes