Malicious PDF — malware analysis report

Static analysis result for SHA-256 0731fa9f93a5a5cd…

MALICIOUS

PDF

33.7 KB Created: 2020-08-21 17:05:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e629939e3df5457dd2bc0b25df0804d SHA-1: 9e903fe5cb3f78d52c9baa83bb302a8ec65c322e SHA-256: 0731fa9f93a5a5cd42f0887049c31ce562fedd2263c695fbb0254ea720ba6777
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to lure victims to malicious sites. The primary attack pattern observed is the use of embedded links for redirection.

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=aankh+maare+simmba+ringtone
    • http://files.dsschoolla.org/uploads/1/3/1/3/131382491/xesatomuvi-jerar-rezuwewidewe-jidunasuxete.pdf
    • http://defodur.saenzmastering.com/uploads/1/3/0/9/130969521/ridixemogo.pdf
    • http://files.homemeadconstruction.co.uk/uploads/1/3/1/8/131857383/wejewez.pdf
    • http://widaf.oakgrovefarmstn.com/uploads/1/3/0/9/130969426/tezupekinirunafiguta.pdf
    • http://files.heartcbarrelhorses.com/uploads/1/3/2/6/132680808/4598166.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/0786/8060/files/rebinobopineminalilone.pdf
    • https://cdn.shopify.com/s/files/1/0431/0063/5290/files/41754195422.pdf
    • https://cdn.shopify.com/s/files/1/0434/4601/0022/files/53536813929.pdf
    • https://cdn.shopify.com/s/files/1/0428/9639/2348/files/loviveduvetirudovi.pdf
    • https://cdn.shopify.com/s/files/1/0439/3032/1051/files/anestesia_general_farmacologia.pdf
    • https://cdn.shopify.com/s/files/1/0431/8448/8610/files/harbor_freight_electric_winch.pdf
    • https://cdn.shopify.com/s/files/1/0434/7510/7990/files/7777871561.pdf
    • https://cdn.shopify.com/s/files/1/0437/3633/4485/files/godakufulekawareb.pdf
    • https://cdn.shopify.com/s/files/1/0433/8968/1822/files/pobunozepikapanit.pdf
    • https://cdn.shopify.com/s/files/1/0434/5744/6038/files/96352143133.pdf
    • https://cdn.shopify.com/s/files/1/0438/7520/5288/files/describing_personality_worksheet.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004725.bin
800836955bcff347adfaab8b7df4f1248cdd9d282aae1cb80354921b293933c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4725 5260 bytes
font_01_sfnt_off000058d3.bin
708fcde288ddc8acb6893678c3a3243328693e1bb13cb3413f3acb8782a86d44		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58D3 9732 bytes

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