Malicious PDF — malware analysis report

Static analysis result for SHA-256 417caade31d0c5cd…

MALICIOUS

PDF

68.5 KB Created: 2020-08-04 10:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 21b6549b23f19820eabbd0822575d2ba SHA-1: 299ccd10dce222a60493c38e73951950f1df2563 SHA-256: 417caade31d0c5cd23b8f9c103a6c553f43076d92b62dc944aec36d1505c8f59
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=autoestima+psicologia+comportamentale+pdf'. This indicates the document's primary purpose is to redirect users to potentially harmful content. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is sufficient evidence of a malicious 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=autoestima+psicologia+comportamentale+pdf
    • http://files.meethsrnorcal.org/uploads/1/3/0/8/130874276/5006003.pdf
    • http://files.careerhighschool.org/uploads/1/3/1/4/131407274/xazebo.pdf
    • http://files.revolutionpapers.com/uploads/1/3/1/4/131413905/d8515c4.pdf
    • https://cdn.shopify.com/s/files/1/0437/7319/8487/files/6th_grade_science_reading_comprehension.pdf
    • https://cdn.shopify.com/s/files/1/0432/8351/3499/files/11409220620.pdf
    • https://cdn.shopify.com/s/files/1/0429/8588/1759/files/angel_del_villar_narcotraficante_wikipedia.pdf
    • https://cdn.shopify.com/s/files/1/0432/5307/2022/files/anleitung_zur_anlage_er_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/87195604050.pdf
    • https://cdn.shopify.com/s/files/1/0435/9041/8591/files/get_around_nyt_paywall.pdf
    • https://cdn.shopify.com/s/files/1/0430/1042/4993/files/96381668356.pdf
    • https://cdn.shopify.com/s/files/1/0434/1520/8098/files/football_skill_download_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0431/7839/3762/files/best_f2p_money_making_osrs.pdf
    • https://cdn.shopify.com/s/files/1/0431/4329/9234/files/punozakewinezidam.pdf
    • https://cdn.shopify.com/s/files/1/0438/4869/5958/files/delivery_receipt_template.pdf
    • https://cdn.shopify.com/s/files/1/0431/0981/0343/files/fuxalisagelejuju.pdf
    • https://cdn.shopify.com/s/files/1/0434/0963/7533/files/32999326066.pdf
    • https://cdn.shopify.com/s/files/1/0428/4373/4182/files/dabasadejoxowig.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c587.bin
fec3a692c6a94d906cf479b29d6b7048b12da56005f2601edb720a8635cd9003		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC587 5464 bytes
font_01_sfnt_off0000d805.bin
b62f15d796e205afdbc071fe18e913d6590f76005c3e981b1ae7b9cd82a83a96		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD805 14688 bytes

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