Malicious PDF — malware analysis report

Static analysis result for SHA-256 83329875f5a242b8…

MALICIOUS

PDF

47.9 KB Created: 2020-08-11 06:33:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f2e1ad38a9570ab7b0cf619b4809de3a SHA-1: e43d88d39bec1a35fcc6bae13afc8d95b7e98c55 SHA-256: 83329875f5a242b83d27c000252e8d711fcbe6db94b4549ef443cb1de7bca37b
130 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, contains text related to study materials and a URL that appears to be a lure. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the presence of a link to known malicious infrastructure, and PDF_SEO_LINK_FARM indicates a large number of external links, suggesting a link farm or SEO poisoning attempt. The SE_DOWNLOAD_BUTTON heuristic further supports the lure-based attack pattern.

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.ru/pify?keyword=antonyms+and+synonyms+list+with+meaning+pdf+for+ssc+exam
    • http://viluwupen.shedrums.net/uploads/1/3/2/3/132303195/jefijizoz_denajalat.pdf
    • http://files.tolecoons.com/uploads/1/3/1/3/131380213/xabuwala-jatibogu-tagevifome-mimeneso.pdf
    • http://files.hsmcwa.org/uploads/1/3/1/3/131380063/vurepa_fevezozimob.pdf
    • https://cdn.shopify.com/s/files/1/0432/7142/2102/files/58221280214.pdf
    • https://cdn.shopify.com/s/files/1/0428/9078/9027/files/21565871609.pdf
    • https://cdn.shopify.com/s/files/1/0437/0428/7383/files/47812800928.pdf
    • https://cdn.shopify.com/s/files/1/0437/1762/3957/files/breviarium_romanum_1962.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/gowoseni.pdf
    • https://cdn.shopify.com/s/files/1/0434/8697/0021/files/sozisazuguvekawufevi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5385/0524/files/alcohol_abuse_definition.pdf
    • https://cdn.shopify.com/s/files/1/0434/9375/2997/files/juzukisil.pdf
    • https://cdn.shopify.com/s/files/1/0429/1811/7543/files/fetefurobebafolalulamoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/78476378890.pdf
    • https://cdn.shopify.com/s/files/1/0434/2887/2359/files/49579877812.pdf
    • https://cdn.shopify.com/s/files/1/0428/1863/3894/files/bikezegidawuludik.pdf
    • https://cdn.shopify.com/s/files/1/0440/4481/2438/files/tokajekow.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_off00007c51.bin
e8ba82aaf6656c8f56eea0249f3402c68e0a8d14184bd6c20a68cfa1f78f0671
pdf-font-stream PDF embedded font (sfnt) at offset 0x7C51 5820 bytes
font_01_sfnt_off0000900e.bin
bc1cbb716926ba4eff92028cd85b7db95274dc5cabb2aedba040e1b7a0f9edae
pdf-font-stream PDF embedded font (sfnt) at offset 0x900E 10012 bytes