Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f99a6e2f7e1e68c…

MALICIOUS

PDF

50.2 KB Created: 2020-08-07 21:24:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3851e296709cc3a61576a3dd3068d0fe SHA-1: dd756c8ab35aa2814a7da104ea9db95f06a31b3d SHA-256: 5f99a6e2f7e1e68cb776e320903da9a326de0a5a98b0215aced3623f7250dc84
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. It also hosts a large number of external PDF links, suggesting a link farm for SEO manipulation or to distribute malicious content. The ML classifier strongly indicates maliciousness, and the embedded URL points to a known malicious redirector.

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=principales+bacterias+patogenas+pdf
    • http://files.sopheriacosplay.com/uploads/1/3/0/7/130739524/3d73724e7fdeba.pdf
    • http://files.jerrydubin.com/uploads/1/3/2/7/132741241/9f8d9289de058.pdf
    • http://files.littlegreenjeep.com/uploads/1/3/0/8/130813747/8549735.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/5761/7823/files/angular_6_material_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0428/0372/4455/files/sing_praises_to_jehovah_songbook.pdf
    • https://cdn.shopify.com/s/files/1/0428/2338/5247/files/purov.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zovoxumaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/9059/9319/files/wexute.pdf
    • https://cdn.shopify.com/s/files/1/0438/8087/4139/files/molapanitowikelij.pdf
    • https://cdn.shopify.com/s/files/1/0434/3955/4727/files/20516127350.pdf
    • https://cdn.shopify.com/s/files/1/0432/0857/3091/files/automotive_technology_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/9085/3540/files/calculus_derivatives_examples_and_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0435/7190/4673/files/53383183534.pdf
    • https://cdn.shopify.com/s/files/1/0431/0351/8882/files/vatamemavobosunaxu.pdf
    • https://cdn.shopify.com/s/files/1/0430/6495/0946/files/forekeken.pdf
    • https://cdn.shopify.com/s/files/1/0428/8803/6505/files/riwovuxa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000794e.bin
dad3c45f3047858a5faa49de89e7bacedfd8ba6e2f3be4a596a67524581a88c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x794E 5252 bytes
font_01_sfnt_off00008b1f.bin
bafbc23ced5ef590e8a31c4571474c6e42ee2d45a6180f83e49b53394c279fe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B1F 10784 bytes
font_02_sfnt_off0000ad1f.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD1F 4324 bytes

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