Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6733905b81e44da…

MALICIOUS

PDF

47.4 KB Created: 2020-10-28 23:39:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd20d85d72854d8e0ef187a0697589df SHA-1: eceb8dca0d2093d240ebd7410c3406a15eb4300b SHA-256: a6733905b81e44da84c796288e9e16c540a6378632e3f38ed93e4d41b29bb771
154 Risk Score

Malware Insights

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

The PDF contains a lure related to a 'Clash Royale generator 2020' and embeds numerous links, one of which points to a known malicious redirector. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains the malicious URL and references to other PDF files, suggesting a link farm designed to redirect users to malicious content.

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://cctraff.ru/aws?keyword=clash+royale+generator+2020
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0440/7777/7061/files/exercice_corrig_distillation_rectification.pdf
    • https://cdn.shopify.com/s/files/1/0433/7241/3079/files/vosor.pdf
    • https://cdn.shopify.com/s/files/1/0437/2594/7029/files/pokemon_sun_moon_guide_book.pdf
    • https://s3.amazonaws.com/pazifetanegapu/bufedaki.pdf
    • https://cdn.shopify.com/s/files/1/0433/1264/4251/files/34436912319.pdf
    • https://cdn.shopify.com/s/files/1/0433/4672/2965/files/cisco_spark_room_admin_guide.pdf
    • https://cdn.shopify.com/s/files/1/0432/7692/7134/files/juwatinimojobitepopigul.pdf
    • https://s3.amazonaws.com/sojebelevenex/guvosegojitugipude.pdf
    • https://cdn.shopify.com/s/files/1/0502/2754/4236/files/conjunctions_worksheet_esl.pdf
    • https://cdn.shopify.com/s/files/1/0427/7056/3239/files/dr_ho_belt_amazon.pdf
    • https://cdn.shopify.com/s/files/1/0500/8821/4699/files/spanish_phrase_app_android.pdf
    • https://cdn.shopify.com/s/files/1/0434/4964/7270/files/vubun.pdf
    • https://cdn.shopify.com/s/files/1/0435/4359/3109/files/wejutarofaninisipa.pdf
    • https://cdn.shopify.com/s/files/1/0437/0602/4090/files/buxaponitulo.pdf
    • https://cdn.shopify.com/s/files/1/0481/3055/6053/files/vejofesekopabof.pdf
    • https://uploads.strikinglycdn.com/files/90f75ede-0301-4f7b-91fc-007e03daeee3/maradabik.pdf
    • https://s3.amazonaws.com/gezejoputiwinu/33208108749.pdf
    • https://cdn.shopify.com/s/files/1/0482/0477/5576/files/chronicles_of_narnia_the_silver_chair.pdf
    • https://cdn.shopify.com/s/files/1/0498/2626/7291/files/jubail_industrial_city_map.pdf
    • https://s3.amazonaws.com/pazifetanegapu/the_pardoner_s_tale_translation.pdf
    • https://cdn.shopify.com/s/files/1/0497/2652/1496/files/2476579016.pdf
    • https://uploads.strikinglycdn.com/files/61cc55e6-9845-4bf7-b24d-34d26838f00f/votovuporikizu.pdf
    • https://s3.amazonaws.com/mijedusovineti/manukamezakukabigup.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_off00006e85.bin
3316cb489ffbe29e41bd4e83b4d2c63a32357e727d45089800c955e5f03c2d18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E85 5088 bytes
font_01_sfnt_off00007fce.bin
35cdb41b371d5c81c3cf8f51fef760bd3472fea0b942ab3ec38eaae71ed7fa60		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7FCE 10088 bytes
font_02_sfnt_off0000a22d.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA22D 4324 bytes

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