Malicious PDF — malware analysis report

Static analysis result for SHA-256 b30be8f7787333dd…

MALICIOUS

PDF

52.1 KB Created: 2020-08-08 20:58:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec99277675d1dbe6ddfde16c2a4a5a93 SHA-1: d57f0a0efb8f47d5d7957aa89eefc618750fc171 SHA-256: b30be8f7787333ddd990c5a7004f88bbb8184c6ff1f530a14e2eebdbf38e98c4
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link to 'ttraff.ru' is identified as a malicious redirector. The document body, though heavily obfuscated, contains the same URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=applied%20mathematics%20volume%201%20pdf
    • http://files.geraldinepilgrim.com/uploads/1/3/2/8/132815346/6780435.pdf
    • http://files.printer-graphics.com/uploads/1/3/1/3/131380297/xidoliboluto.pdf
    • http://files.rockymtlaceguild.org/uploads/1/3/1/8/131871424/zewubek_ziwozulim.pdf
    • http://files.starrystarryskies.com/uploads/1/3/2/7/132740623/09411a.pdf
    • http://files.grayhawkpto.com/uploads/1/3/1/4/131453332/df8206d.pdf
    • https://cdn.shopify.com/s/files/1/0431/1338/2044/files/icy_tower_charecters.pdf
    • https://cdn.shopify.com/s/files/1/0432/4697/7179/files/jarotoweno.pdf
    • https://cdn.shopify.com/s/files/1/0432/6293/5200/files/al_ghazali_s_philosophical_theology.pdf
    • https://cdn.shopify.com/s/files/1/0429/5668/5468/files/69706201220.pdf
    • https://cdn.shopify.com/s/files/1/0434/3513/1046/files/ropimiron.pdf
    • https://cdn.shopify.com/s/files/1/0429/6956/3290/files/kekifozuziziwikisexaxi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7065/1542/files/applied_mathematics_113_solved_questions_and_answers.pdf
    • https://cdn.shopify.com/s/files/1/0430/7812/3680/files/tatefotidolatisufu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9910/2110/files/12407342439.pdf
    • https://cdn.shopify.com/s/files/1/0437/7152/7325/files/69953891209.pdf
    • https://cdn.shopify.com/s/files/1/0435/4434/6792/files/20862546348.pdf
    • https://cdn.shopify.com/s/files/1/0433/6533/5208/files/sototiwadow.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_off00007cc8.bin
bd862d749e8f64d561dc67fffdddbab1998cac69562746640ab2e0cf5c8da0fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CC8 5176 bytes
font_01_sfnt_off00008e79.bin
722bf088f9df005560918cd58d0136686a11b1b7203508cf6038169f0f078456		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E79 11500 bytes
font_02_sfnt_off0000b3b5.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B5 4324 bytes

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