Malicious PDF — malware analysis report

Static analysis result for SHA-256 b54e531246e6ff56…

MALICIOUS

PDF

45.1 KB Created: 2020-07-27 17:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf44ff1d6fa0fe210f73ac4831516fae SHA-1: 59572e52775417a42ce338b8e264fd866bd38f48 SHA-256: b54e531246e6ff5649166230c4a452aabe37952bfe85f5b9aa07309ba97eef20
152 Risk Score

Malware Insights

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

The PDF contains a link to a redirector service, which is a common tactic for delivering malware or phishing pages. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, appears to contain keywords related to job opportunities, likely serving as a lure.

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.com/pify?keyword=android+developer+jobs+in+egypt
    • http://files.multinationalmemphis.org/uploads/1/3/0/7/130739379/c19ea6.pdf
    • http://files.mbearsemedia.com/uploads/1/3/1/3/131398025/3627588.pdf
    • http://files.hollidaystudios.com/uploads/1/3/1/4/131483307/1770677.pdf
    • http://files.sbeghen.net/uploads/1/3/1/4/131453226/7577934.pdf
    • https://cdn.shopify.com/s/files/1/0433/4613/3157/files/94960140980.pdf
    • https://cdn.shopify.com/s/files/1/0431/4251/2791/files/xilupevagugajibefimosupaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/meragavafeduxilaxopuxaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/0934/2614/files/falolor.pdf
    • https://cdn.shopify.com/s/files/1/0432/7833/6165/files/bisejosem.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sobobubujuwin.pdf
    • https://cdn.shopify.com/s/files/1/0432/6119/8491/files/rewut.pdf
    • https://cdn.shopify.com/s/files/1/0436/1817/3086/files/31124176609.pdf
    • https://cdn.shopify.com/s/files/1/0428/0582/1599/files/wazotofikitawu.pdf
    • https://cdn.shopify.com/s/files/1/0432/9183/6566/files/76640257164.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6791/files/gabibevosetimegodep.pdf
    • https://cdn.shopify.com/s/files/1/0435/0138/7936/files/jivikutugegulogesifix.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_off000072b3.bin
e692d913b26d1c9046b818d3112cecc42414da074c95fc170f2f80b27bc5df7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x72B3 5072 bytes
font_01_sfnt_off00008408.bin
b09fcbb5efd3fa6bdf5f5b5aabd4cf1757437f226ad07050a146aef519bb3a20
pdf-font-stream PDF embedded font (sfnt) at offset 0x8408 10316 bytes