Malicious PDF — malware analysis report

Static analysis result for SHA-256 817ef0542b4c6781…

MALICIOUS

PDF

49.5 KB Created: 2020-08-26 02:44:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6783fdb87a30b24e7a91bfcda14f3d63 SHA-1: a724c0f968bccb67fc46dae708e6668ef6ad8a6f SHA-256: 817ef0542b4c67815b255f1727be9a408855f1e6ef116ff54c084b965c9a1dd0
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to a redirector service known for malicious activity. The document body, though partially corrupted, includes the same malicious URL and benign-looking filenames, suggesting a lure to disguise the malicious intent. The ML classifier strongly indicates maliciousness, and the presence of a redirector URL confirms the intent to lead the user to a harmful destination.

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=half+marathon+training+schedule+for+beginners+8+weeks
    • http://files.julioachavez.com/uploads/1/3/1/4/131437919/pelidisasezex-panibemuvo-pilas.pdf
    • http://vogoman.jodyrathgeb.com/uploads/1/3/2/6/132695615/magaposewevi.pdf
    • http://files.elizabethadabale.com/uploads/1/3/1/4/131437689/57613a8de.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/3009/2696/files/lightning_flame_dragon_roaring_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0431/2937/2832/files/81467580330.pdf
    • https://cdn.shopify.com/s/files/1/0429/6913/7305/files/chauvet_obey_70_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/6134/6466/files/fumesonavosetidom.pdf
    • https://cdn.shopify.com/s/files/1/0433/1618/3205/files/alpha_1_antitrypsin_deficiency_liver.pdf
    • https://cdn.shopify.com/s/files/1/0450/5387/0232/files/luneruzigimotorabekeko.pdf
    • https://cdn.shopify.com/s/files/1/0436/2626/6782/files/user_authentication_mechanisms_in_network_security.pdf
    • https://cdn.shopify.com/s/files/1/0431/5460/4198/files/nidupat.pdf
    • https://cdn.shopify.com/s/files/1/0432/3537/7307/files/91211783676.pdf
    • https://cdn.shopify.com/s/files/1/0429/5321/2060/files/50418790054.pdf
    • https://cdn.shopify.com/s/files/1/0429/2254/1209/files/wedupe.pdf
    • https://cdn.shopify.com/s/files/1/0432/9324/5590/files/28582192578.pdf
    • https://cdn.shopify.com/s/files/1/0433/1572/4443/files/18419951071.pdf
    • https://cdn.shopify.com/s/files/1/0430/3486/9921/files/23623487725.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_off000080d7.bin
945b2760afd2022b791ce4f55a713aec36a595b36985fe2ea27255e36f9efbbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80D7 5888 bytes
font_01_sfnt_off000094c4.bin
e0b618b5a6ba9fb5fb3e76188f6a541b72a60042dbaafe6473eda7fa3d42f078		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94C4 10352 bytes

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