Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a51c8c0b3aec531…

MALICIOUS

PDF

40.9 KB Created: 2020-08-19 00:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 75967c84d47930c5eb480da037eeae7d SHA-1: af22c1d2ca553f7569feccc806cf41f84faf448f SHA-256: 7a51c8c0b3aec53104e5d48bb70193004644f76500f0b75c09c0d5c160548ff8
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though obfuscated, contains a URL that appears to be the primary lure. The presence of a 'download button' heuristic further supports the social engineering aspect of this attack. No scripts were extracted, but the overall structure suggests a phishing attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=bhola+song+2019+mp4
    • http://files.forteacademyofmusic.com/uploads/1/3/1/1/131164311/8934391.pdf
    • http://files.campcenterstage.org/uploads/1/3/1/0/131069915/7385712.pdf
    • http://files.bethanylutheranrlf.com/uploads/1/3/1/3/131381819/sizumomonogup.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/7708/4070/files/taporek.pdf
    • https://cdn.shopify.com/s/files/1/0438/0976/7584/files/kukuxidafe.pdf
    • https://cdn.shopify.com/s/files/1/0429/9161/6153/files/jntuk_b._pharmacy_syllabus_r16.pdf
    • https://cdn.shopify.com/s/files/1/0438/4532/0861/files/navogavodakado.pdf
    • https://cdn.shopify.com/s/files/1/0440/2115/3957/files/advanced_data_structures_and_algorithms_notes_for_me_cse.pdf
    • https://cdn.shopify.com/s/files/1/0435/7423/1199/files/id_card_photoshop_template_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/7897/5639/files/49935619521.pdf
    • https://cdn.shopify.com/s/files/1/0431/4788/6743/files/kuwerozumuwesadu.pdf
    • https://cdn.shopify.com/s/files/1/0429/4947/6518/files/23276103988.pdf
    • https://cdn.shopify.com/s/files/1/0433/8073/6165/files/dezefugonoxozavibusowi.pdf
    • https://cdn.shopify.com/s/files/1/0433/4724/7263/files/manual_prctico_de_auditora_interna.pdf
    • https://cdn.shopify.com/s/files/1/0433/7565/7121/files/anna_karenina_ebook.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_off000061cc.bin
d4c6cb52b47049357374569302ffef5f5a6f76152a89dd13ae06bc77ad382b12		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61CC 5756 bytes
font_01_sfnt_off00007544.bin
f5757d93992f5ea8368bbf0c398ffa0e80da74bd4d9979d73f8fd478bff5d60b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7544 9884 bytes

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