Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b19f79a7acfd57e…

MALICIOUS

PDF

50.2 KB Created: 2020-08-14 13:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67ed4b85e54726e1670b7025b6730293 SHA-1: 0920b333e96c6e017610880af596562795a2bae4 SHA-256: 7b19f79a7acfd57e9e18c7349affa0c153d43fef276aabfe991b605c7e0bf2bc
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a link farm, with one primary malicious redirector identified. The document body, though obfuscated, contains the URL "https://ttraff.ru/pify?keyword=thyroid+cancer+guidelines+2019", suggesting a lure to disguise malicious activity. The heuristic firings confirm the presence of malicious redirector links and a link farm, indicating an attempt to distribute further malicious content or phish users. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=thyroid+cancer+guidelines+2019
    • http://files.cccelkhart.org/uploads/1/3/0/8/130874253/vejaxafum.pdf
    • http://files.learningtobuyahome.com/uploads/1/3/1/4/131406391/wepawodugibelo.pdf
    • http://files.rosemclarney.com/uploads/1/3/0/8/130874210/zuzopowafuniroful.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/5294/7873/files/bellini_intelli_kitchen_master_manual.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vejumilaro.pdf
    • https://cdn.shopify.com/s/files/1/0431/8484/9045/files/john_deere_826_snowblower_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/0334/6078/files/betepip.pdf
    • https://cdn.shopify.com/s/files/1/0434/3637/6231/files/adversarial_machine_learning.pdf
    • https://cdn.shopify.com/s/files/1/0428/9380/3679/files/metroid_nes_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/3420/6620/files/55029825734.pdf
    • https://cdn.shopify.com/s/files/1/0432/0047/9391/files/77217730509.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/zilabafegerenumulewelobej.pdf
    • https://cdn.shopify.com/s/files/1/0435/7423/1199/files/castle_crashers_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0431/8212/9320/files/24689983157.pdf
    • https://cdn.shopify.com/s/files/1/0447/4611/3173/files/cambridge_igcse_business_studies_workbook_answers.pdf
    • https://cdn.shopify.com/s/files/1/0428/4815/7859/files/38484642396.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_off0000851f.bin
3bbc3962a2a319e2c26cf7cb457122f62924f8d047b015fdf0aca2f61b2ea7a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x851F 5732 bytes
font_01_sfnt_off000098a3.bin
323eb1fc7f116b337345ae0ed5023c3e6f959505244215c1cd455fa9ed4f3dd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x98A3 10264 bytes

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