Malicious PDF — malware analysis report

Static analysis result for SHA-256 6960182f93bca21f…

MALICIOUS

PDF

44.4 KB Created: 2020-07-29 01:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f786cb82e55c39c29a83b8d705c2e9af SHA-1: 9e035b48eb4f6cf45c30f7c85adf7741df73bbc5 SHA-256: 6960182f93bca21fe9b4edbd2a446031e5e942786375def1fdd8fd5c5c2a43fa
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying it as a malicious redirector link farm. The primary URL, 'https://ttraff.ru/pify?keyword=amahi+home+server+iso', is flagged as malicious. The document body is heavily obfuscated, but the presence of many external PDF links suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, but the overall structure and heuristics point to a malicious intent to redirect users to harmful sites.

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=amahi+home+server+iso
    • http://files.soundhorseandhound.com/uploads/1/3/1/8/131858791/6240824.pdf
    • http://files.parkcitybrewery.shop/uploads/1/3/1/4/131437079/vafutofuside_puxawos_simesokaluv_nakimowatafawin.pdf
    • http://files.sharpfokus.com/uploads/1/3/1/3/131383771/792f7921a35.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/9166/5830/files/rusulelesadedenujug.pdf
    • https://cdn.shopify.com/s/files/1/0430/1602/8309/files/49921531042.pdf
    • https://cdn.shopify.com/s/files/1/0431/8865/0142/files/sufadodaxavodaxaza.pdf
    • https://cdn.shopify.com/s/files/1/0434/8759/2608/files/88861181532.pdf
    • https://cdn.shopify.com/s/files/1/0427/4513/5260/files/23852414155.pdf
    • https://cdn.shopify.com/s/files/1/0437/6241/7825/files/tavikofapevukanukogageve.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wevanedinuwisuvajolow.pdf
    • https://cdn.shopify.com/s/files/1/0439/4765/5323/files/dapebetisulelov.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/pigetuworibuborezalupu.pdf
    • https://cdn.shopify.com/s/files/1/0432/2705/4237/files/39765400647.pdf
    • https://cdn.shopify.com/s/files/1/0440/3711/1973/files/gidolakilowav.pdf
    • https://cdn.shopify.com/s/files/1/0429/4026/8711/files/70293838261.pdf
    • https://cdn.shopify.com/s/files/1/0441/1283/8808/files/16746034696.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_off000072d6.bin
6d1e2318cee817b5e7b091ee0b5cb540e5248518d564444672c0cc4077aaf1da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72D6 4544 bytes
font_01_sfnt_off0000822f.bin
5f00a8ea3e4990a9af9fc997bfe70ecd1645bb95c8d10d06c09a56c9200e393b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x822F 10056 bytes

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