Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6b6e7c905d9247…

MALICIOUS

PDF

65.2 KB Created: 2020-08-15 18:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 46da77cf7137144904ce0ce23c766876 SHA-1: 1c7af1626880c0d2e3a118187fd1dc24e7d894b4 SHA-256: 5b6b6e7c905d9247b792515d751e03e269a2cc7e18bb41c8c1b7a52f829ebcfc
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be part of the link farm. The presence of numerous links suggests an attempt to drive traffic to malicious sites, potentially for phishing or SEO spam.

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=maps.+me+android+review
    • http://gagelejew.readthemandeat.com/uploads/1/3/2/6/132681670/vodeves.pdf
    • http://files.ihmconferencecenter.com/uploads/1/3/0/7/130776493/8090370.pdf
    • http://files.nightriserscon.com/uploads/1/3/2/6/132681308/tizokipagibuna-kepimeroromi-kirasuf-gufaxi.pdf
    • http://files.msmeiningersclass.com/uploads/1/3/1/1/131164168/kejuverubonatuj_nikasozopez_gozurovedejuli.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/7258/5888/files/fovukotas.pdf
    • https://cdn.shopify.com/s/files/1/0434/8110/4541/files/86205044857.pdf
    • https://cdn.shopify.com/s/files/1/0431/7816/4384/files/dopimuxuniveduw.pdf
    • https://cdn.shopify.com/s/files/1/0429/5039/4019/files/dupalofudisuwu.pdf
    • https://cdn.shopify.com/s/files/1/0437/8905/8206/files/analogy_reasoning_notes.pdf
    • https://cdn.shopify.com/s/files/1/0434/5449/6935/files/34502231613.pdf
    • https://cdn.shopify.com/s/files/1/0437/8217/6920/files/78030327666.pdf
    • https://cdn.shopify.com/s/files/1/0438/3290/1789/files/microbiology_bacteriology_notes.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/kiwovanigefuminif.pdf
    • https://cdn.shopify.com/s/files/1/0432/0778/6654/files/brainstorming_template.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a2bb.bin
2ad44190c2b50b5c9871ff15e5b8f93bcd8e1af2ee744203af133b41cccafa6e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA2BB 5260 bytes
font_01_sfnt_off0000b49b.bin
113a67c841af57ed574cc30f094b4ef4e38ec5e5c1b7e8fe725d20ab3659442d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB49B 1700 bytes
font_02_sfnt_off0000bd19.bin
65132a186aa4851366eeaf03afee4146567d087cf7c4bf0d175b072acf49f04a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD19 10772 bytes
font_03_sfnt_off0000e226.bin
64f21e55c2f29c6f605e8f9fd96e7f7b34f9b4a26fdc717ddead948457370e3b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE226 16148 bytes

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