Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e69ed2e10118dc…

MALICIOUS

PDF

37.9 KB Created: 2020-08-03 23:37:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1b831a74d789b7c3472160cbc1311183 SHA-1: 5882677917d917eddfd949b2a0fa4c7447173541 SHA-256: 81e69ed2e10118dc0c7a9698ade6a27666c4e0ae4271890b19d0bc1ba8841863
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded links, many of which point to a link farm hosted on Shopify. The primary malicious link, 'https://ttraff.cc/pify?keyword=administra%25C3%25A7%25C3%25A3o+de+recursos+humanos+george+bohlander+pdf', is identified as a malicious redirector. This suggests the document is designed to lure users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted, but the presence of numerous external links and the malicious redirector strongly indicate a phishing or redirection attack.

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=administra%25C3%25A7%25C3%25A3o+de+recursos+humanos+george+bohlander+pdf
    • http://files.mypittsburgchamber.org/uploads/1/3/1/3/131379732/vipot.pdf
    • http://files.insomnilacq.com/uploads/1/3/1/4/131454316/ce438c4ecec406c.pdf
    • http://files.hsvsnycslay.org/uploads/1/3/1/6/131637073/terexarowa_vodiwax_kumuliripom.pdf
    • http://files.ourmotherslight.com/uploads/1/3/1/1/131163943/1646228.pdf
    • http://files.sandimorais.com/uploads/1/3/0/9/130969551/53555dba5c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/1320/0278/files/xedekebuxo.pdf
    • https://cdn.shopify.com/s/files/1/0435/2707/8052/files/67585962977.pdf
    • https://cdn.shopify.com/s/files/1/0431/4680/5408/files/46937552993.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/85409494139.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/saran.pdf
    • https://cdn.shopify.com/s/files/1/0438/2271/0941/files/3845071496.pdf
    • https://cdn.shopify.com/s/files/1/0432/1827/2423/files/php_multiple_constructors.pdf
    • https://cdn.shopify.com/s/files/1/0432/1358/6596/files/gezemutedovanilolezesufa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/75555741983.pdf
    • https://cdn.shopify.com/s/files/1/0429/8866/7039/files/73173211665.pdf
    • https://cdn.shopify.com/s/files/1/0437/5629/0206/files/pink_vissual_pass.pdf
    • https://cdn.shopify.com/s/files/1/0431/8350/5570/files/lonoluluwowar.pdf
    • https://cdn.shopify.com/s/files/1/0439/4621/3544/files/partynextdoor_p3_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6689/2186/files/53842522574.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_off00004f46.bin
1ca2eed2638513e394b2a1287840fb87bfc2f72da73169569b15f4e210ced96a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F46 6200 bytes
font_01_sfnt_off00006356.bin
523aa8c767ff5dbb30fe5c8b448a9668b14ee5e17bbcf14a4d8410e9a656096f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6356 12048 bytes

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