Malicious PDF — malware analysis report

Static analysis result for SHA-256 728a59a1bec342ac…

MALICIOUS

PDF

37.9 KB Created: 2020-08-25 05:10:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fe569cbe99f106789dde9bbd7b8ee810 SHA-1: d2dadd2ceae17233e0b86e780198269450a9ce4f SHA-256: 728a59a1bec342acc042f8f2602e93632cd5ec872e3b3671bb034b9c7e8bd70c
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text that appears to be a lure for 'choki choki ar mobile legends apk', suggesting a phishing or scam attempt. The PDF also hosts a large number of external links, many pointing to Shopify, which is characteristic of SEO link farm abuse.

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=choki+choki+ar+mobile+legends+apk
    • http://files.xuwang.us/uploads/1/3/1/3/131398236/6380c8989da450.pdf
    • http://files.joshualevinefoundation.org/uploads/1/3/2/7/132712139/a35363c1.pdf
    • http://nexebo.mkeddleman.com/uploads/1/3/1/4/131438044/fadosujugudube.pdf
    • http://gavolele.vanessaarmandtesol.com/uploads/1/3/0/9/130969858/2333518.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0439/4424/7451/files/megemi.pdf
    • https://cdn.shopify.com/s/files/1/0429/8702/8639/files/30662305243.pdf
    • https://cdn.shopify.com/s/files/1/0437/4170/8437/files/xenelusulifujak.pdf
    • https://cdn.shopify.com/s/files/1/0433/3397/6223/files/apa_format_references_journal_articles_online.pdf
    • https://cdn.shopify.com/s/files/1/0434/0809/7445/files/56223116412.pdf
    • https://cdn.shopify.com/s/files/1/0433/7677/1233/files/caries_dental_infantil.pdf
    • https://cdn.shopify.com/s/files/1/0428/7817/3343/files/longman_advanced_english_dictionary_free.pdf
    • https://cdn.shopify.com/s/files/1/0436/4032/4256/files/13631238127.pdf
    • https://cdn.shopify.com/s/files/1/0433/1870/6341/files/84107869161.pdf
    • https://cdn.shopify.com/s/files/1/0433/6369/6805/files/suunto_altimax_manual.pdf
    • https://cdn.shopify.com/s/files/1/0427/9071/5548/files/never_be_alone_piano_sheet_music.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000044ee.bin
616a2b7ee261f859669d94365b7d5de2e73f54c77c04a54d0c6927fbfe232eda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x44EE 5420 bytes
font_01_sfnt_off0000571f.bin
a6aaf44fd29dfccb31727321b4d4116ebdb4db63ea1402f934e97a2baf335c09		 pdf-font-stream PDF embedded font (sfnt) at offset 0x571F 10864 bytes
font_02_sfnt_off00007adb.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ADB 4324 bytes

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