Malicious PDF — malware analysis report

Static analysis result for SHA-256 0db22e3bb56995ee…

MALICIOUS

PDF

38.0 KB Created: 2020-08-14 07:51:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72025fafe12cc342b3503b6e1a77eaa3 SHA-1: 016d92f63f49054b1606fe47a523085dc016b2b6 SHA-256: 0db22e3bb56995ee2c40d0c03aaab0dd487612697ea58dd21b7ce1113d1da2f5
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text suggesting it is a worksheet, likely a lure to encourage clicks on the malicious links. The presence of a large number of external PDF links further indicates a link farm, often used for SEO poisoning or to distribute malware.

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=mitosis+worksheet+and+diagram+identification+answer
    • http://files.yukondaffodils.com/uploads/1/3/0/8/130814009/xararutibojezi_wufulalo_bazef_muwawekimanusoj.pdf
    • http://sesib.artisandogharness.com/uploads/1/3/1/4/131453133/7273084.pdf
    • http://files.interlochenchamber.org/uploads/1/3/1/3/131379820/f4f14abf66e.pdf
    • http://files.teararangatahi.com/uploads/1/3/1/0/131069987/pobiripu.pdf
    • http://files.dragonflycoulee.com/uploads/1/3/2/6/132681634/2097085.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/8641/3985/files/pilesemebijawos.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/pesib.pdf
    • https://cdn.shopify.com/s/files/1/0433/4298/7422/files/vamaganil.pdf
    • https://cdn.shopify.com/s/files/1/0435/1708/3803/files/mogewuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/9631/7845/files/65678395930.pdf
    • https://cdn.shopify.com/s/files/1/0440/7505/7302/files/vemip.pdf
    • https://cdn.shopify.com/s/files/1/0437/8312/7201/files/fejedi.pdf
    • https://cdn.shopify.com/s/files/1/0429/5727/5299/files/koxopipovin.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wetidolurat.pdf
    • https://cdn.shopify.com/s/files/1/0433/3492/6495/files/85609428882.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7696/files/woguxumot.pdf
    • https://cdn.shopify.com/s/files/1/0434/7301/0845/files/43506940811.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_off00005653.bin
3556c047f973bc2391837b7ec1b6ebf2c3a6edd74ee810c41eba309e6377a653		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5653 5564 bytes
font_01_sfnt_off0000692c.bin
27896e89394679a9d29c7647326d71a16acc6ecfeabd3fb56f009ac70f2666dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x692C 9916 bytes

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