Malicious PDF — malware analysis report

Static analysis result for SHA-256 1930b2b5d558c7ad…

MALICIOUS

PDF

46.1 KB Created: 2020-08-05 00:15:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d3a9269497c6035fd788c4a4452fa6e SHA-1: 2ce5ec85de1cde2843c339b488d45f1fa0870993 SHA-256: 1930b2b5d558c7adb34268aba9c99c1bd4e11e5fda6a5bc3b87e43764ed4bbb7
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to external PDF files, suggesting a link farm or SEO spamming tactic. One prominent link, disguised as a songbook, redirects to a known malicious URL. The ML classifier also strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or redirection attempt.

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=piano+beginners+songbook+pdf
    • http://xetimuza.arteducationdesign.com/uploads/1/3/1/6/131636655/4fcadfc01eb0.pdf
    • http://files.nicoledrakewright.ca/uploads/1/3/1/4/131454052/murikoseru.pdf
    • http://zotas.wangmusicdesigns.com/uploads/1/3/2/8/132816036/6498374.pdf
    • http://files.daniellamoffsonfoundation.com/uploads/1/3/2/7/132740435/da3b4.pdf
    • http://kulikeveg.historicnewportspring.org/uploads/1/3/1/4/131453247/kesafonefidi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/8829/8659/files/wisupogo.pdf
    • https://cdn.shopify.com/s/files/1/0436/7931/8166/files/mobile_phone_addiction_questionnaire.pdf
    • https://cdn.shopify.com/s/files/1/0432/9163/9968/files/advanced_calculus_1_book.pdf
    • https://cdn.shopify.com/s/files/1/0432/6300/0736/files/getuwijapemigasunaj.pdf
    • https://cdn.shopify.com/s/files/1/0432/2826/6654/files/linear_algebra_friedberg.pdf
    • https://cdn.shopify.com/s/files/1/0430/6393/5129/files/celebrity_endorsement_case_study.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9803/files/business_intelligence_a_managerial_approach_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/5650/5756/files/vojasetuzu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2412/0984/files/kepukalovogubemolujodi.pdf
    • https://cdn.shopify.com/s/files/1/0429/0763/1783/files/81673263857.pdf
    • https://cdn.shopify.com/s/files/1/0430/2965/9805/files/noxawuwonusunin.pdf
    • https://cdn.shopify.com/s/files/1/0436/1610/8707/files/malaimalar_news_paper.pdf
    • https://cdn.shopify.com/s/files/1/0432/3550/8387/files/medicinal_and_aromatic_plants_industrial_profiles.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/viruxirekosarobavogerij.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_off00007655.bin
0f2f2ec0f819ac0cb5d413a4991e8bd627541db260d68b6b7da75d201c912e1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7655 5380 bytes
font_01_sfnt_off000088b0.bin
a13992dc6a3f52b463573f5e78c00e7b3e6e48faf57ca757a7fc76c4ef1a18d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88B0 10120 bytes

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