Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c52933cd33e0ee6…

MALICIOUS

PDF

49.8 KB Created: 2020-08-22 02:03:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab1c9dd5acde1560880cdd425cecc5b2 SHA-1: 5785852c3f74b583c0579bdf0117d23d58df1857 SHA-256: 7c52933cd33e0ee670b50b2f165af84fb7a2f8279f18252b7c1a83012f641f27
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to potentially malicious redirectors or SEO link farms. The document body text, though garbled, includes references to 'Aitken spence plc annual report 2018' and a URL that appears to be a lure for this report. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous links suggests an attempt to distribute malware or phish for credentials.

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=aitken+spence+plc+annual+report+2018
    • http://wuxos.stclementscambridge.org/uploads/1/3/1/4/131453109/8218685.pdf
    • http://fikagesiz.reportcard.mrslambsroom.com/uploads/1/3/0/7/130776791/1958281.pdf
    • http://buduk.washi-art.net/uploads/1/3/0/7/130776106/9466592.pdf
    • http://zujewuwi.laneanimalhosp.com/uploads/1/3/1/3/131398404/bejum-sadepinekiz-podetevuxasexud.pdf
    • http://files.rosskay.com/uploads/1/3/1/4/131408581/pabamuwov-jukizax-texuxixigilim.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/1274/2550/files/sojozinufotaxisapukabus.pdf
    • https://cdn.shopify.com/s/files/1/0434/3490/1671/files/cookie_clicker_pantheon.pdf
    • https://cdn.shopify.com/s/files/1/0428/7417/5644/files/zukaxivesuwaded.pdf
    • https://cdn.shopify.com/s/files/1/0436/3078/8758/files/95492031191.pdf
    • https://cdn.shopify.com/s/files/1/0438/9008/1960/files/sozifuvejesasepepelo.pdf
    • https://cdn.shopify.com/s/files/1/0432/6863/6834/files/81495597037.pdf
    • https://cdn.shopify.com/s/files/1/0430/6350/9141/files/risiruzurikazifu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1152/9114/files/90471727359.pdf
    • https://cdn.shopify.com/s/files/1/0437/1021/8391/files/bit_web_server_apk_pro.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sosivizugepu.pdf
    • https://cdn.shopify.com/s/files/1/0429/9997/1999/files/dijavileporarijamuduw.pdf
    • https://cdn.shopify.com/s/files/1/0432/5477/5970/files/makatefolazijunosivi.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_off000084c8.bin
542fe7af0337cebf6cb720cacec8edbd3bf7f09a7b5da4e769fabd3c712662fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84C8 5500 bytes
font_01_sfnt_off0000978a.bin
64f293da2bcc680642c5f0c818e4922b64dc9234d3fbefc6608ec6bff1b3fe7c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x978A 10088 bytes

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