Malicious PDF — malware analysis report

Static analysis result for SHA-256 15de4175e47bb311…

MALICIOUS

PDF

43.7 KB Created: 2020-08-07 12:40:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5a2658e61f8608091e18830b2aa8ef07 SHA-1: 1fc6fd12c569d0600a465c86415d9f16f5b943bb SHA-256: 15de4175e47bb31173b5361a8e4cde3025da8d5b814e1a4bced6321788a87979
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, indicating a link farm or SEO spamming operation. One prominent URL, 'https://ttraff.ru/pify?keyword=difference+between+restricted+earth+fault+and+differential+protection+pdf', is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the nature of the embedded links and the redirector suggest an attempt to drive traffic to malicious infrastructure.

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=difference+between+restricted+earth+fault+and+differential+protection+pdf
    • http://files.creekdebate.org/uploads/1/3/1/3/131380915/468ff.pdf
    • http://wawikomut.thecommonstheatre.org/uploads/1/3/1/6/131637136/4931930.pdf
    • http://files.upliftedforlife.com/uploads/1/3/2/3/132302940/6227050.pdf
    • http://files.graffitiwgratitude.com/uploads/1/3/0/7/130738814/808e7b1556b9ad.pdf
    • http://files.johnvukusic.com/uploads/1/3/1/3/131380031/c3ab01de1d6896.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/5575/2103/files/drugs_abbreviation_list.pdf
    • https://cdn.shopify.com/s/files/1/0427/8134/3900/files/66089594102.pdf
    • https://cdn.shopify.com/s/files/1/0434/0108/5082/files/7502453462.pdf
    • https://cdn.shopify.com/s/files/1/0431/7213/5074/files/79017933949.pdf
    • https://cdn.shopify.com/s/files/1/0432/4953/3088/files/mevizabagewewobedakugexog.pdf
    • https://cdn.shopify.com/s/files/1/0431/5804/4827/files/bamoraremeg.pdf
    • https://cdn.shopify.com/s/files/1/0430/0088/9507/files/archimate_certification_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/5064/8223/files/40953763978.pdf
    • https://cdn.shopify.com/s/files/1/0431/6263/2360/files/tazinalirafarorekugis.pdf
    • https://cdn.shopify.com/s/files/1/0437/1503/5288/files/36703947281.pdf
    • https://cdn.shopify.com/s/files/1/0432/7014/4166/files/viviwomimemav.pdf
    • https://cdn.shopify.com/s/files/1/0440/9910/9016/files/tenafutedinuzisolatod.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_off00006d1d.bin
d9118947e5e8658eb6cebc1dcc7df35dd238b26a16e5174dd9fb73af77d069ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D1D 5472 bytes
font_01_sfnt_off00007fca.bin
e10e6ecd4045eda2787e3925e48ca2561cae5946e0161978cb93b03bf6b0c544		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FCA 9796 bytes

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