Malicious PDF — malware analysis report

Static analysis result for SHA-256 f75a5437c9c24657…

MALICIOUS

PDF

45.2 KB Created: 2020-08-09 10:17:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5371ed1ba9b19af4c3ecf3e695f56f1 SHA-1: 10237d13fefeb2a32fd4885b30790df830c1e50d SHA-256: f75a5437c9c246576083ecaf293c72127c11ab25b9be2cf2e9311ede0776fd61
128 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, disguised as an answer key download. It also hosts a large number of external PDF links, many pointing to Shopify domains, suggesting a link farm designed to improve search engine ranking for the malicious content. The presence of a download button lure further supports the deceptive nature of the document.

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=cet+2020+answer+key+pdf+download
    • http://files.crumblesbynicole.com/uploads/1/3/1/4/131483069/e72d2973e98.pdf
    • http://files.sarahgancher.org/uploads/1/3/0/7/130775135/rakugu_luvixifij.pdf
    • http://gufefonel.firstbaptistnewhaven.org/uploads/1/3/1/4/131453870/f480e9.pdf
    • http://files.londonderryhomeowners.com/uploads/1/3/1/8/131871730/siwufudipab.pdf
    • http://files.relax-body-day-spa.com/uploads/1/3/0/7/130775982/63dd8d099829b.pdf
    • https://cdn.shopify.com/s/files/1/0437/6834/8830/files/26612411609.pdf
    • https://cdn.shopify.com/s/files/1/0432/3786/7687/files/61792279806.pdf
    • https://cdn.shopify.com/s/files/1/0438/2726/5693/files/ligolaza.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0719/files/90596016998.pdf
    • https://cdn.shopify.com/s/files/1/0439/4146/2174/files/bejebutadugezimutitofoz.pdf
    • https://cdn.shopify.com/s/files/1/0429/0058/6649/files/kibotoluwiwopadutemil.pdf
    • https://cdn.shopify.com/s/files/1/0430/3667/2162/files/vodofevisusisesi.pdf
    • https://cdn.shopify.com/s/files/1/0431/1675/7153/files/34267907081.pdf
    • https://cdn.shopify.com/s/files/1/0429/0304/4263/files/19907356974.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/1410277578.pdf
    • https://cdn.shopify.com/s/files/1/0430/8353/0407/files/css_nth_child.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006546.bin
904e8a9693604dfda7c683bed2ab132ecf4845b7ad4b0d277ff1608ed79db475
pdf-font-stream PDF embedded font (sfnt) at offset 0x6546 5328 bytes
font_01_sfnt_off00007786.bin
87c4028f2be8fe01fcfb3a355fc3db3988bce9db971fcdd34331f5fc95ca8987
pdf-font-stream PDF embedded font (sfnt) at offset 0x7786 10012 bytes
font_02_sfnt_off000099d7.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x99D7 4324 bytes