Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2cd1eac6cd03fc0…

MALICIOUS

PDF

63.4 KB Created: 2020-08-04 11:48:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cef7bd46ae335822efe28a21a3a7b9a9 SHA-1: 279093cbbba1f276c338502deec91e27f91bc86e SHA-256: f2cd1eac6cd03fc0e6890cdfcda92b3893c0e131783d31943dd9187de2dd3c4b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link that redirects to malicious infrastructure, disguised as a book summary. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this behavior. The document body, though heavily obfuscated, contains the URL and text suggesting a lure. The presence of numerous external links, including the malicious redirector, indicates a link farm or redirection strategy to distribute further payloads.

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=emotional+intelligence+book+summary+pdf
    • http://files.firesportukgolf.co.uk/uploads/1/3/0/9/130969356/tanurisu_nelazomemi_gipesoxefotedo_nubuxudo.pdf
    • http://files.melissasmith.net.au/uploads/1/3/2/7/132741020/domewagobipofa_puwejoreno_lifogaxowodo.pdf
    • http://files.halfmoonday.com/uploads/1/3/0/7/130775992/e72f9f10249.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/20726054751.pdf
    • https://cdn.shopify.com/s/files/1/0430/9182/0711/files/54732349423.pdf
    • https://cdn.shopify.com/s/files/1/0432/5982/2243/files/girexitatusexuzowazil.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8584587797.pdf
    • https://cdn.shopify.com/s/files/1/0435/2737/2964/files/zujepeledetuta.pdf
    • https://cdn.shopify.com/s/files/1/0435/2117/9816/files/8512209406.pdf
    • https://cdn.shopify.com/s/files/1/0434/5063/0297/files/overwatch_file_size.pdf
    • https://cdn.shopify.com/s/files/1/0432/5883/9198/files/81574098169.pdf
    • https://cdn.shopify.com/s/files/1/0434/0944/0917/files/9267123960.pdf
    • https://cdn.shopify.com/s/files/1/0433/7526/3898/files/zoramebukosedanuzinulo.pdf
    • https://cdn.shopify.com/s/files/1/0427/6797/4556/files/71368738513.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_off0000b9fd.bin
71ad08d0f28a1dfa4bbb97a3558c1ba0ef8b65660dbf4c68d6bc99f4f9e5c011
pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FD 5736 bytes
font_01_sfnt_off0000cd73.bin
9feec7b99157ff886254812d1b2b65f3f2508e3a38e4a77c6dc69befc1cb64a7
pdf-font-stream PDF embedded font (sfnt) at offset 0xCD73 10316 bytes