Malicious PDF — malware analysis report

Static analysis result for SHA-256 342f328a18ffdcc3…

MALICIOUS

PDF

39.4 KB Created: 2020-08-12 10:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 626ba041bab256e6fa33df654c928dc2 SHA-1: 45d1906a1534bfc7ea90f7592bc6e0bbaa21c9bd SHA-256: 342f328a18ffdcc3c279556306cffccd6e29400f8630df20387107b64ee40d21
194 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to SEO-optimized PDF files, a common tactic for link farms. One critical heuristic identified a link to a known malicious redirector, ttraff.ru, which likely serves as a gateway to malicious content. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains a URL that appears to be part of this malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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=cisco+ccna+voice+syllabus+pdf
    • http://files.stjamesstjames.org/uploads/1/3/0/9/130969446/lipudagufiwawi_zoxixumefa_pavakitowufe_figexubaxupejes.pdf
    • http://wotekis.ao-americas.com/uploads/1/3/1/6/131637136/xibugopon.pdf
    • http://files.newlifestylesnepelenaferraretto.com/uploads/1/3/0/7/130775174/70b24689.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/4145/5254/files/5648969571.pdf
    • https://cdn.shopify.com/s/files/1/0432/6745/7182/files/sokonigexip.pdf
    • https://cdn.shopify.com/s/files/1/0437/4583/7208/files/37173541412.pdf
    • https://cdn.shopify.com/s/files/1/0428/5497/3606/files/algebra_2_solving_rational_equations.pdf
    • https://cdn.shopify.com/s/files/1/0434/0557/4309/files/mafurufujulibos.pdf
    • https://cdn.shopify.com/s/files/1/0431/7852/4832/files/sway_dean_martin_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0434/3224/7457/files/capsaicina_pura.pdf
    • https://cdn.shopify.com/s/files/1/0448/4985/6669/files/morphemes_morphs_and_allomorphs.pdf
    • https://cdn.shopify.com/s/files/1/0432/9072/2472/files/viposuveganazaxag.pdf
    • https://cdn.shopify.com/s/files/1/0434/9411/3446/files/97167016015.pdf
    • https://cdn.shopify.com/s/files/1/0435/2750/4024/files/back_to_school_activities_for_kindergarten.pdf
    • https://cdn.shopify.com/s/files/1/0434/9621/0594/files/4311183404.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_off00005cbb.bin
e8349df308c6cfcf4db4ab194e0599846698173869c598e751600755ef998038		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CBB 5260 bytes
font_01_sfnt_off00006eb4.bin
a8edb58b7f872d74f9171b3bf76bbb148aafa02ec59435d8f315ba9a7f7ed01b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EB4 10032 bytes

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