Malicious PDF — malware analysis report

Static analysis result for SHA-256 843abda3d5ead953…

MALICIOUS

PDF

48.7 KB Created: 2020-08-14 01:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c59ea707ca1cc382c49e30d3022e18fd SHA-1: f328dcd89cabe11513a3578cf7f954653a78e818 SHA-256: 843abda3d5ead953dcefe1b2f3b4d8db57e493fd6479cc5a8a3033d0dd2bf684
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous embedded links, with one critical heuristic identifying a link to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text referencing 'anonytun apk uptodown' and the malicious URL, suggesting a lure to download potentially unwanted or malicious software. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the analysis of direct payload execution.

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.com/pify?keyword=anonytun+apk+uptodown
    • http://files.inspectmyhomehpi.com/uploads/1/3/2/6/132681938/logimiwarot.pdf
    • http://files.destinationweddingsbigisland.com/uploads/1/3/0/7/130738681/24680089f761.pdf
    • http://mukix.pccwindsor.com/uploads/1/3/1/8/131856713/3a496e8d7bad9.pdf
    • http://kutofo.tamrisfarmnubians.com/uploads/1/3/1/3/131380600/dokogugapusunonutis.pdf
    • http://devis.discoverhispresence.com/uploads/1/3/2/8/132815176/gexagarokomogu_pejagoro_bunep.pdf
    • https://cdn.shopify.com/s/files/1/0431/4310/2618/files/9332859383.pdf
    • https://cdn.shopify.com/s/files/1/0430/0672/2211/files/simile_and_metaphor_lesson_plan.pdf
    • https://cdn.shopify.com/s/files/1/0430/8929/7568/files/life_and_death_read_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/2204/9695/files/jeradozegaxujeramuguza.pdf
    • https://cdn.shopify.com/s/files/1/0434/6170/5890/files/java_sort_map_by_value.pdf
    • https://cdn.shopify.com/s/files/1/0435/5833/8715/files/sivemukitotugemuvij.pdf
    • https://cdn.shopify.com/s/files/1/0429/3876/1379/files/68338542187.pdf
    • https://cdn.shopify.com/s/files/1/0431/7852/4831/files/rekolepuwanutibakejejagop.pdf
    • https://cdn.shopify.com/s/files/1/0444/5070/9671/files/3000842084.pdf
    • https://cdn.shopify.com/s/files/1/0434/7274/8710/files/atmospheric_science_an_introductory_survey_solutions.pdf
    • https://cdn.shopify.com/s/files/1/0434/0957/1990/files/gawobipabu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/faramerujinusopuko.pdf
    • https://cdn.shopify.com/s/files/1/0433/1316/8542/files/xaxifegulogoxidotikat.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000067f1.bin
e1576d83cb4b775953f65fd0dc8e25fb7fb3ff554f97b270c859d40e5e9ffe23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67F1 4896 bytes
font_01_sfnt_off000078ce.bin
916f938a66dff0abf8029e38b726005cc5e7c7b1b3eb562306aab54243512758		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78CE 15136 bytes
font_02_sfnt_off0000a8ad.bin
0a62fd26ed47161df3486920f156de0c8aeefceb0cbb95d8d29d5f3b6bb237f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8AD 3300 bytes

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