Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c60b1f0b713c249…

MALICIOUS

PDF

42.3 KB Created: 2020-08-10 02:00:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5f813a18c9881fb7ca36930c554d3b6 SHA-1: 72598d57d7e262f3411faf539bc8aadc002263c7 SHA-256: 7c60b1f0b713c24917df28c1dde8ffb6ef80addf73fc4aacd03af36475fb2235
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.ru. The document body, though heavily obfuscated, contains the same URL and a reference to 'business analytics and intelligence pdf', suggesting a lure. Additionally, the PDF hosts a large number of external links, many pointing to Shopify domains, which is indicative of a link farm used for SEO poisoning or distributing malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.ru/pify?keyword=business+analytics+and+intelligence+pdf
    • http://files.enfesnefes.com/uploads/1/3/1/3/131383533/gukexosu.pdf
    • http://files.apollongu.org/uploads/1/3/1/4/131411896/rugevi-tolupokanuwuf-zonidinusaki-diziba.pdf
    • http://files.caroldmarsh.com/uploads/1/3/1/4/131482886/kibojezur_widavodukexo_vazulaxo.pdf
    • http://punozexi.windwolf.com/uploads/1/3/2/8/132814930/7358166a7d.pdf
    • https://cdn.shopify.com/s/files/1/0438/5672/4128/files/alabama_football_2020_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0432/2597/2904/files/naxamupekenif.pdf
    • https://cdn.shopify.com/s/files/1/0437/2804/4193/files/bryant_oden_the_duck_song.pdf
    • https://cdn.shopify.com/s/files/1/0433/9079/5941/files/53149270508.pdf
    • https://cdn.shopify.com/s/files/1/0433/4957/3784/files/didoxetukubametevu.pdf
    • https://cdn.shopify.com/s/files/1/0439/8972/9438/files/php_proxy_scripts.pdf
    • https://cdn.shopify.com/s/files/1/0434/1517/5317/files/43998218480.pdf
    • https://cdn.shopify.com/s/files/1/0429/8761/8463/files/zewik.pdf
    • https://cdn.shopify.com/s/files/1/0431/7688/6431/files/nopilobilepajibetaxozi.pdf
    • https://cdn.shopify.com/s/files/1/0433/6097/7048/files/cathedral_game_rules.pdf
    • https://cdn.shopify.com/s/files/1/0431/1659/3312/files/sowedokanob.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_off000067e1.bin
3224154b54e6fb02abf9d91914b318d6c06cbc43296ddacf55e74891dd6ee17b
pdf-font-stream PDF embedded font (sfnt) at offset 0x67E1 5376 bytes
font_01_sfnt_off00007a52.bin
9381c73818631930245dd91ee2c4fc7984eff1ecfd0daf1ddb0dbe364c0f3e5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7A52 9952 bytes