Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a9428df993244b…

MALICIOUS

PDF

60.4 KB Created: 2020-08-03 15:06:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9d1be9b291c53cf2150267efd3edf7a SHA-1: 38a3776672db45b12ca6925d98bd2443ad18ee07 SHA-256: e4a9428df993244b1c261bb88eb234908b544a6e6b3c9899890c121e6b111be1
152 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The document body text, though partially corrupted, mentions 'Photogrammetry pdf book', likely a lure to entice users to click the malicious link. The ML classifier strongly supports the malicious nature of this PDF.

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.cc/pify?keyword=photogrammetry+pdf+book
    • http://files.coverbpodcast.com/uploads/1/3/2/6/132681495/bazewevowusu.pdf
    • http://files.allison-kiefnerburmeister.com/uploads/1/3/2/7/132740362/6661002.pdf
    • http://files.dancinggrains.com/uploads/1/3/2/6/132681885/17e03c24e14b9.pdf
    • http://files.dhhdancecollaborative.com/uploads/1/3/1/4/131437291/b7b7a087f72d25.pdf
    • http://files.janhumphriesphoto.com/uploads/1/3/1/0/131069899/a63137bdec.pdf
    • https://cdn.shopify.com/s/files/1/0432/5031/9517/files/kopinonorixage.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6911/files/wolebepasixekavakagumugij.pdf
    • https://cdn.shopify.com/s/files/1/0428/2525/3023/files/98550996997.pdf
    • https://cdn.shopify.com/s/files/1/0433/8024/4643/files/merge_mac_os_preview.pdf
    • https://cdn.shopify.com/s/files/1/0433/5173/6471/files/mabaponobiw.pdf
    • https://cdn.shopify.com/s/files/1/0439/0515/5240/files/zezagojokumad.pdf
    • https://cdn.shopify.com/s/files/1/0431/4277/4938/files/76240410709.pdf
    • https://cdn.shopify.com/s/files/1/0438/3621/1357/files/24348987248.pdf
    • https://cdn.shopify.com/s/files/1/0430/3755/6889/files/no_man_s_sky_graphics_settings.pdf
    • https://cdn.shopify.com/s/files/1/0429/5743/9129/files/17124698344.pdf
    • https://cdn.shopify.com/s/files/1/0433/1087/4777/files/57557305956.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000993d.bin
b69b6e1e05a602e0f63243c2080ef9aebfe55227ec553405646b9420fb551f83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x993D 5552 bytes
font_01_sfnt_off0000abf9.bin
0bc2d4a1f5327ec97afdf5e8fbe49fc63afff3254eb8c384a1a9bbe9950eec4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xABF9 10376 bytes
font_02_sfnt_off0000cf67.bin
ebaa9d42c58e3fd25c8264bcf4ef2319fee467c92cf53dcc1f377a20fc8d39b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF67 16148 bytes

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