Malicious PDF — malware analysis report

Static analysis result for SHA-256 79814d4a96ac9ef3…

MALICIOUS

PDF

44.4 KB Created: 2020-08-07 00:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ace5dc1858577fbc4f44de1152800db3 SHA-1: d49e8c3919dc3c84d0516ad22810ef991ddc5690 SHA-256: 79814d4a96ac9ef34be9bac05cc3277b0741fffd82b2d596256c0e9f369a573b
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 a 'free course'. The presence of a link farm heuristic further indicates a malicious intent to drive traffic to potentially harmful sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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.ru/pify?keyword=curso+viol%25C3%25A3o+gratis+pdf
    • http://jugod.msangelaboratko.com/uploads/1/3/0/8/130813747/kozadetizituz-wegomujiwir.pdf
    • http://nakasukag.inglishmiqlana.com/uploads/1/3/2/6/132695569/6071798.pdf
    • http://files.lfhsfoundation.org/uploads/1/3/1/8/131856476/darozasuzix.pdf
    • http://files.anniev-test.com/uploads/1/3/1/4/131408798/fc11baff.pdf
    • http://files.earlbyrdthethird.com/uploads/1/3/0/7/130739910/5210225.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4583/8232/files/47264163003.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/80804151078.pdf
    • https://cdn.shopify.com/s/files/1/0436/5982/1209/files/jepegewilafemi.pdf
    • https://cdn.shopify.com/s/files/1/0437/6769/3474/files/finopomatagurugare.pdf
    • https://cdn.shopify.com/s/files/1/0432/8692/1374/files/82889873493.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5056/files/andrea_wilson_facebook_hacker.pdf
    • https://cdn.shopify.com/s/files/1/0440/1987/5998/files/les_textes_apocryphes.pdf
    • https://cdn.shopify.com/s/files/1/0435/4077/5064/files/64412010438.pdf
    • https://cdn.shopify.com/s/files/1/0431/5004/9448/files/92613224005.pdf
    • https://cdn.shopify.com/s/files/1/0433/8188/3030/files/66763057295.pdf
    • https://cdn.shopify.com/s/files/1/0437/9456/3229/files/applied_mathematics_3_diploma.pdf
    • https://cdn.shopify.com/s/files/1/0439/1842/6267/files/roman_catholic_prayers.pdf
    • https://cdn.shopify.com/s/files/1/0437/6972/5085/files/rimejukavatadowe.pdf
    • https://cdn.shopify.com/s/files/1/0431/8229/3141/files/vabugomevolalop.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000068c1.bin
5db7c0d64b289cf0b08ad7ab8bb476d3cb6db445c400c3d8c42078ac8542017f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x68C1 5492 bytes
font_01_sfnt_off00007af3.bin
47c80e3f2695c084ffc88d819cbaeba782e5e48a0c689864737fc9248ec58f4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7AF3 13544 bytes

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