Malicious PDF — malware analysis report

Static analysis result for SHA-256 6644e5a29b3905f9…

MALICIOUS

PDF

47.0 KB Created: 2020-08-10 15:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 397d8108ff486f47a7ba19adc82b9b71 SHA-1: 98cf1a9dab46eeb43bdc79b0bbb242619539f813 SHA-256: 6644e5a29b3905f9e9c5ab714753a930ab201966502730d53f025be9c143199b
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 partially corrupted, suggests a lure related to 'psat practice test 1 answers pdf'. The presence of a link farm and a critical ML classification further support malicious intent, likely to redirect users to malicious sites or download further payloads.

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=psat+practice+test+1+answers+pdf
    • http://jexik.tara-sarahna.com/uploads/1/3/0/7/130776791/26b3f916cbb88.pdf
    • http://files.poolbuildersmckinney.com/uploads/1/3/1/8/131871658/7776508.pdf
    • http://wiwalawis.seakapparel.com/uploads/1/3/0/8/130814328/acc4b64102f.pdf
    • http://kinere.moranenterprises.com/uploads/1/3/1/3/131398367/5406266.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/4879/6309/files/96064996927.pdf
    • https://cdn.shopify.com/s/files/1/0431/7960/6176/files/zigavesajevojexebeduni.pdf
    • https://cdn.shopify.com/s/files/1/0429/8581/6218/files/29520373875.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/dagezaluvonanapukinuwit.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/vakevawibuxajorefiwuzan.pdf
    • https://cdn.shopify.com/s/files/1/0431/8606/1480/files/xalefor.pdf
    • https://cdn.shopify.com/s/files/1/0432/5317/0339/files/cuento_de_peter_pan_en_ingles.pdf
    • https://cdn.shopify.com/s/files/1/0428/2574/4547/files/31890005374.pdf
    • https://cdn.shopify.com/s/files/1/0432/8482/4222/files/buxupolejijinowatofodami.pdf
    • https://cdn.shopify.com/s/files/1/0432/9832/4638/files/44983512735.pdf
    • https://cdn.shopify.com/s/files/1/0433/7578/8188/files/is_between_two_ferns_staged.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005752.bin
4fab7a9a412f6c9bc06b1e123d2eeb06028b959c1de455f0f38f7b4aead7d54d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5752 5260 bytes
font_01_sfnt_off0000695b.bin
f33cfaa92ad43b0e49400abe02d623e5f485b166ad7f6bbe7006c61f8a4d6fe1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x695B 14732 bytes
font_02_sfnt_off00009786.bin
532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9786 16204 bytes

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