Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3584bf267feedf1…

MALICIOUS

PDF

32.6 KB Created: 2020-08-22 07:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17355f0dba824349a2635bca67d6947b SHA-1: d60915a71d5fa2e281318578d7b2c61eb2e33f61 SHA-256: e3584bf267feedf1d4c82f9f15cdd986453521668dac157da88fe8749abf092a
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a primary link leading to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a 'Bangla movie protibad video'. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports a malicious intent to redirect users to harmful 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=bangla+movie+protibad+video
    • http://files.jaromirnosal.net/uploads/1/3/1/8/131856079/5069533.pdf
    • https://cdn.shopify.com/s/files/1/0430/3496/8213/files/zijiloj.pdf
    • https://cdn.shopify.com/s/files/1/0430/3863/8241/files/ethiopian_protected_areas.pdf
    • https://cdn.shopify.com/s/files/1/0433/4052/9816/files/10352159486.pdf
    • https://cdn.shopify.com/s/files/1/0432/4248/7972/files/72615382373.pdf
    • https://cdn.shopify.com/s/files/1/0434/1461/8277/files/welifam.pdf
    • https://cdn.shopify.com/s/files/1/0437/6428/5601/files/figibumosovomebesuwojivev.pdf
    • https://cdn.shopify.com/s/files/1/0434/9113/1557/files/16684372010.pdf
    • https://cdn.shopify.com/s/files/1/0430/8952/6951/files/92058458841.pdf
    • https://cdn.shopify.com/s/files/1/0431/6302/5559/files/multivariable_calculus_stewart_4th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0435/1511/7727/files/raspberry_pi_network_manager.pdf
    • https://cdn.shopify.com/s/files/1/0431/5758/6071/files/zanagamimerebimuximumip.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6654/files/48256786699.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_off00004323.bin
c3b103dff075df742ea4054cfdfd0c1c121197a1bc82912c93566d273712104a
pdf-font-stream PDF embedded font (sfnt) at offset 0x4323 5348 bytes
font_01_sfnt_off00005538.bin
b5897bd9b86d017764109fb4bfc4ad8971279397b724191fd9a0c7d5d551793c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5538 9556 bytes