Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cf2d7943b3828d3…

MALICIOUS

PDF

60.2 KB Created: 2020-08-17 15:09:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d64a52493519fc5ee68eeadaf0ee995 SHA-1: c050eb76adeb07c3ed30a488c865ce7a490950f8 SHA-256: 4cf2d7943b3828d384d003cb0159706f9b40eefe249bcfb2626c2f1ee88e715c
152 Risk Score

Malware Insights

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

The PDF contains embedded links, with one pointing to a known malicious redirector at 'ttraff.ru'. The document body text, though partially corrupted, includes a reference to 'mlsu private exam form date 2019', suggesting a lure for phishing or credential harvesting. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy, likely to improve SEO for malicious content or to obscure the ultimate destination. The ML classifier 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=mlsu+private+exam+form+date+2019
    • http://files.dressagestars.com/uploads/1/3/0/9/130969472/f15daf.pdf
    • https://cdn.shopify.com/s/files/1/0432/0709/8529/files/assembler_plusieurs_avec_foxit.pdf
    • https://cdn.shopify.com/s/files/1/0431/4556/0219/files/zuvagopesomozaniravad.pdf
    • https://cdn.shopify.com/s/files/1/0432/2243/3953/files/53678375229.pdf
    • https://cdn.shopify.com/s/files/1/0430/4535/5682/files/pulses_images_to.pdf
    • https://cdn.shopify.com/s/files/1/0437/6123/8168/files/nombre_rationnel_et_irrationnel_exercice.pdf
    • https://cdn.shopify.com/s/files/1/0433/4842/6920/files/ginusuxumiv.pdf
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/jowunelazijafijaniw.pdf
    • https://cdn.shopify.com/s/files/1/0430/9961/9492/files/migiw.pdf
    • https://cdn.shopify.com/s/files/1/0436/9501/4056/files/77502543533.pdf
    • https://cdn.shopify.com/s/files/1/0434/0501/7255/files/28413501983.pdf
    • https://cdn.shopify.com/s/files/1/0433/4888/5662/files/66821921109.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/gawulamajujemu.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off0000bd9f.bin
749652baf53f8bfec29b16d2bee8888b63bde63282df6f542274062a929171d2		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xBD9F 11296 bytes
font_00_sfnt_off00006edd.bin
1aa9b76e42fdcdaefc67c858404bf0dd4022e999aff558fc1eb5f35b5587b0ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EDD 5804 bytes
font_01_sfnt_off0000829d.bin
d0c9e33916e9e64e42e31bcf0d345f6c2fcd41735b1a34df0119bd0eb1094281		 pdf-font-stream PDF embedded font (sfnt) at offset 0x829D 3720 bytes
font_02_sfnt_off00008e01.bin
0ca709645dfdad83798b63dd86c9bc9cdb59a340c98fe385af40b519fb41fe1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E01 15228 bytes

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