Malicious PDF — malware analysis report

Static analysis result for SHA-256 70bf8f0fac740b37…

MALICIOUS

PDF

48.0 KB Created: 2020-08-07 21:20:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb4a75f5ee1dbc2e823aed9253813930 SHA-1: d8885a959aeddfe8e8ad5e7fc526825d502bfd63 SHA-256: 70bf8f0fac740b37ed2fd2e5095bcc98613d0edade51e515e4b736d0f0365bb4
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of the primary links directs to a known malicious redirector infrastructure. The document body, though partially corrupted, suggests a lure related to song lyrics for guitar, likely to trick users into clicking the malicious links. No scripts were extracted, but the presence of numerous external links indicates a strong intent to redirect users to potentially harmful content.

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=letras+y+acordes+de+canciones+para+guitarra+pdf
    • http://files.greaterthangoods.com/uploads/1/3/0/7/130739614/wetejema.pdf
    • http://files.anupamxp.com/uploads/1/3/1/8/131856158/4d12a204a9d4.pdf
    • http://files.gabrielsartkids.com/uploads/1/3/1/4/131483361/c2a63899.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1313/6799/files/kogerexubibedo.pdf
    • https://cdn.shopify.com/s/files/1/0429/4115/3439/files/2099615017.pdf
    • https://cdn.shopify.com/s/files/1/0428/9550/7622/files/zuverujomegavafurat.pdf
    • https://cdn.shopify.com/s/files/1/0432/5575/9011/files/77944227558.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/40169505762.pdf
    • https://cdn.shopify.com/s/files/1/0433/9197/5580/files/banozotetese.pdf
    • https://cdn.shopify.com/s/files/1/0431/9041/9620/files/63333582528.pdf
    • https://cdn.shopify.com/s/files/1/0433/7388/7649/files/twitch._tv_kitboga.pdf
    • https://cdn.shopify.com/s/files/1/0431/3006/0955/files/gofivonefugasovavekupidil.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1942/files/97049145658.pdf
    • https://cdn.shopify.com/s/files/1/0448/4674/3709/files/dexter_s_lab_monkey.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_off00006fe1.bin
124e871353704fc0767448769145e657564dc59b9d95b2497c589586fbbf66f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FE1 5332 bytes
font_01_sfnt_off0000821a.bin
7ef6cb6698fea806eec66effba9ae77859a8e18c03169e66e212b1421c87ab72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x821A 1888 bytes
font_02_sfnt_off00008b2d.bin
3990c40cd9a607f268ba831c2d65b3b7b733196b869d879efa9cd4fd89c68376		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B2D 11440 bytes

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