Malicious PDF — malware analysis report

Static analysis result for SHA-256 077d7766aa843907…

MALICIOUS

PDF

49.0 KB Created: 2020-08-21 23:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8247b18382617cc2de9bf0def1337c28 SHA-1: d8cda2ab957b5f9c10bbd66f623adfa8e9c4dda0 SHA-256: 077d7766aa84390755fe9fbfc9cc77036d310943ede58719e088f34a5d1a79c2
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that mirrors the one identified by the PDF_SEO_LINK_FARM heuristic, suggesting an attempt to drive traffic to malicious or SEO-farmed content. The ML classifier also strongly indicated maliciousness.

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=appium+1.+8.+0++for+mac
    • http://guwemimef.megadryforce.com/uploads/1/3/0/8/130874284/werimu-sawujasit-kuguzosagejixe-fujusurivava.pdf
    • http://duxuvama.kennysmithfreedomfoundation.org/uploads/1/3/1/3/131383791/3950176.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5555/4458/files/69634987789.pdf
    • https://cdn.shopify.com/s/files/1/0436/7617/2441/files/arihant_maths_books_for_competitive_exams_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/6597/4690/files/vovulusomi.pdf
    • https://cdn.shopify.com/s/files/1/0430/7173/3917/files/zixemawamakubelebimebipa.pdf
    • https://cdn.shopify.com/s/files/1/0431/3799/0805/files/48924472371.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3846/files/95416857717.pdf
    • https://cdn.shopify.com/s/files/1/0431/1498/7674/files/examen_ser_bachiller_2020_sierra.pdf
    • https://cdn.shopify.com/s/files/1/0432/7315/8806/files/dagekosalarakutudefowug.pdf
    • https://cdn.shopify.com/s/files/1/0434/5649/5769/files/pubigapib.pdf
    • https://cdn.shopify.com/s/files/1/0430/4565/0586/files/advantages_of_technology_in_society.pdf
    • https://cdn.shopify.com/s/files/1/0436/0034/7299/files/selusumoburovazenil.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_off00006b59.bin
bc50bff0b16c616c32f5e523eac776885631d76044bc52020d897bc9db3f28f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B59 5360 bytes
font_01_sfnt_off00007d84.bin
702d9cdaea6572a77588e1087415a1fdc93c0f84c3dec859e5d5ad2b384962be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D84 10512 bytes
font_02_sfnt_off0000a1a0.bin
b2cbfceaf44fc4a56d1321c5677f125dfbde6a5f8c873b6a17361dd7c2aa5302		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA1A0 16232 bytes

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