Malicious PDF — malware analysis report

Static analysis result for SHA-256 03312c9a90195afa…

MALICIOUS

PDF

47.1 KB Created: 2020-07-29 23:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b40c3c3cea296aa6fd66bb40f8205b53 SHA-1: 2a7e3114511333bc9516707fd72c5c0cfac04a51 SHA-256: 03312c9a90195afa25037193b5cf5fcde5d3f102462cc7c27eaaecd02d0d0961
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one pointing to a known malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass external PDF link farm, suggesting a tactic to drive traffic to potentially malicious sites. 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.com/pify?keyword=animal+physiology+cardiovascular+system+pdf
    • http://files.thecountup.com/uploads/1/3/1/6/131637248/giride-gofiso-waramejedubine.pdf
    • http://files.rsgymnastics.org/uploads/1/3/0/7/130776060/9240920.pdf
    • http://files.orlcpc.com/uploads/1/3/1/3/131380146/kadudirokiwi-gopagunew-sagezutatuxojir.pdf
    • http://files.juicyenglish.com/uploads/1/3/0/8/130873965/5984995.pdf
    • http://files.thesocialscientist.net/uploads/1/3/1/0/131070894/dumagedovexi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0692/6741/files/bexoruxeboriwigotifimoxi.pdf
    • https://cdn.shopify.com/s/files/1/0431/5676/6882/files/36881273858.pdf
    • https://cdn.shopify.com/s/files/1/0431/5657/0266/files/muvuzuluviveruribipuja.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tanedikefiresemur.pdf
    • https://cdn.shopify.com/s/files/1/0431/9644/8917/files/sodikojefufaras.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gifizazuxapi.pdf
    • https://cdn.shopify.com/s/files/1/0433/5593/0783/files/79653170625.pdf
    • https://cdn.shopify.com/s/files/1/0431/9779/2420/files/wutugejatazuvasamus.pdf
    • https://cdn.shopify.com/s/files/1/0427/8878/2236/files/53262369928.pdf
    • https://cdn.shopify.com/s/files/1/0432/3151/0690/files/pekeborezavuv.pdf
    • https://cdn.shopify.com/s/files/1/0433/3279/6574/files/79106707802.pdf
    • https://cdn.shopify.com/s/files/1/0429/8542/2997/files/moneme.pdf
    • https://cdn.shopify.com/s/files/1/0432/0496/8603/files/74745749277.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_off000079b6.bin
95f3c3c441f4e4e4a55b9c324d1edafafbc56d0351727090686c7d49d0ff96eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79B6 5604 bytes
font_01_sfnt_off00008c94.bin
d1dc293486864bdf7a393dce697a07f1d98b883b16c9324c114fa39584f65694		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C94 9968 bytes

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