Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e9853da33d2d95…

MALICIOUS

PDF

36.7 KB Created: 2020-08-03 13:45:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: acadc8dc3260ead0b9e590ceb1806821 SHA-1: 484e244f0d7b5fb5a380c3cc57ed11c4b6c6d332 SHA-256: 16e9853da33d2d95b3ce3f35346c97df96428947f85aa1de2ea3be600e960a06
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body and embedded links suggest a lure for free PDF downloads, which is a common tactic for phishing or malware distribution. 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=foundations+of+behavioral+neuroscience+9th+edition+pdf+free
    • http://files.chswim.com/uploads/1/3/1/0/131070173/tanaz.pdf
    • http://files.westcoastsailingclub.ca/uploads/1/3/1/6/131637853/33ef32b.pdf
    • http://files.belvistahoa.com/uploads/1/3/2/7/132712129/4175064.pdf
    • http://files.ardentrive.com/uploads/1/3/0/7/130740175/pokib_xodedakadikasuf_lexujepege.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/4835/2406/files/rurininedasidetofisipi.pdf
    • https://cdn.shopify.com/s/files/1/0438/6550/5952/files/71326385622.pdf
    • https://cdn.shopify.com/s/files/1/0427/5198/3783/files/60716420111.pdf
    • https://cdn.shopify.com/s/files/1/0432/5625/0525/files/57033513546.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bodadajigewodozisidezufe.pdf
    • https://cdn.shopify.com/s/files/1/0436/0683/5358/files/xufizirepubunapiru.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/tikumakosesik.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/xenomanezumegefofepexatik.pdf
    • https://cdn.shopify.com/s/files/1/0432/8180/9558/files/33557495397.pdf
    • https://cdn.shopify.com/s/files/1/0439/8107/8686/files/pivafikivozixav.pdf
    • https://cdn.shopify.com/s/files/1/0429/9682/6273/files/81950067806.pdf
    • https://cdn.shopify.com/s/files/1/0432/6785/0390/files/55267536834.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kemulubu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6670/4550/files/boeing_standard_wiring_practices_manual.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_off000050c1.bin
6b1e742d879fd390bbef6796530f9a050f3bb2446611288ff7547e771cef7172		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50C1 5556 bytes
font_01_sfnt_off000063a0.bin
fba495d854fef53743430ac7264b0e69f13726b81d544b7a1aa0f7715f033265		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63A0 9932 bytes

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