Malicious PDF — malware analysis report

Static analysis result for SHA-256 c512798b7530d59f…

MALICIOUS

PDF

34.9 KB Created: 2020-08-09 19:37:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 80e326f69c37f6bafde17e83400b24f9 SHA-1: 67199e548ed7241708ccee7d057227d92ef5ebf3 SHA-256: c512798b7530d59f97a1c5dc22761989cddfc8507d6ebda5312bccf43ec5a025
128 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify domains, but one critical link directs to a known malicious redirector. This redirector is disguised as a search result for 'assembly language pdf github', indicating a lure to trick users into clicking. The presence of a visual download button further supports a social engineering attempt. No scripts were extracted, but the link farm and redirector strongly suggest a phishing or malware distribution attempt.

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=assembly+language+pdf+github
    • http://xolil.maverickwellnessboston.com/uploads/1/3/1/0/131070161/gubisopagal.pdf
    • http://pidekis.jessieofalltrades.com/uploads/1/3/2/7/132712615/wurof-pizikitaxuzi.pdf
    • http://nejode.foxtapestrydesign.com/uploads/1/3/0/7/130776485/1357184.pdf
    • http://files.emilydeibler.com/uploads/1/3/1/3/131384468/b44c23.pdf
    • https://cdn.shopify.com/s/files/1/0439/8442/1022/files/tegidumunolixibaxuganawuz.pdf
    • https://cdn.shopify.com/s/files/1/0437/7319/8497/files/44354679552.pdf
    • https://cdn.shopify.com/s/files/1/0430/6780/1749/files/99438933571.pdf
    • https://cdn.shopify.com/s/files/1/0431/9592/4640/files/67814885867.pdf
    • https://cdn.shopify.com/s/files/1/0432/2964/2911/files/tofiwokunutu.pdf
    • https://cdn.shopify.com/s/files/1/0434/1248/8348/files/gate_2020_ee_paper.pdf
    • https://cdn.shopify.com/s/files/1/0433/9925/0072/files/64107256897.pdf
    • https://cdn.shopify.com/s/files/1/0427/9848/1564/files/mipis.pdf
    • https://cdn.shopify.com/s/files/1/0434/3165/7638/files/28965314632.pdf
    • https://cdn.shopify.com/s/files/1/0430/8339/9329/files/xowem.pdf
    • https://cdn.shopify.com/s/files/1/0436/1070/1981/files/96009412903.pdf
    • https://cdn.shopify.com/s/files/1/0432/9573/5976/files/15217908319.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_off00004b06.bin
3834b6c1825582eb49a43e60d40b14c502e89fbf94e883b1f368ad5524589e0b
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B06 5588 bytes
font_01_sfnt_off00005de7.bin
a1345f97955af248336d00e9501ce169786e4a8737331c5ba72dc5eca3fc2503
pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE7 9632 bytes