Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f4822cc15bee6c8…

MALICIOUS

PDF

43.9 KB Created: 2020-09-01 03:41:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f315be353f9c09ba3993bf9bb7427f91 SHA-1: bad903c6ba1edd49cbc309b3afe6d5a00088cefd SHA-256: 6f4822cc15bee6c8ea9b55813c794860a358ee03389e87fa89a63d588109d407
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a malicious domain, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be part of a link farm designed to manipulate search engine results. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be directing users to a malicious site via a deceptive link.

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.com/wix?keyword=caperucita+roja+cuento+hermanos+grimm+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0446/2074/2819/files/bks_iyengar_books.pdf
    • https://cdn.shopify.com/s/files/1/0437/7408/3233/files/75512794214.pdf
    • https://cdn.shopify.com/s/files/1/0429/8565/2375/files/raxuxodamogijuzidi.pdf
    • https://static.usrfiles.com/ugd/930050_dbd46871163446cb95ed7db02f3e94d8.pdf
    • https://static.usrfiles.com/ugd/b8c837_85610b545a39410487a610b3e7dfc8c2.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_50400162ed39464db9a0fb9b7289c948.pdf
    • https://cdn.shopify.com/s/files/1/0434/0747/4844/files/robotic_process_automation_blue_prism.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/99316866522.pdf
    • https://cdn.shopify.com/s/files/1/0436/8387/2921/files/xerugutigobamakifizizisi.pdf
    • https://cdn.shopify.com/s/files/1/0437/9305/5904/files/md_state_abbreviation.pdf
    • https://cdn.shopify.com/s/files/1/0460/1688/8999/files/kozosotuwike.pdf
    • https://cdn.shopify.com/s/files/1/0436/2744/6435/files/program_to_convert_to_excel_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/0994/9341/files/bapivuvevog.pdf
    • https://cdn.shopify.com/s/files/1/0429/4914/8838/files/angle_relationships_worksheet_2_answer_key.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_off00006c4f.bin
6b26ccb1c4652cce3167daaaaf15ad6f2541bed7b550dc7b97b097ad4a236b13
pdf-font-stream PDF embedded font (sfnt) at offset 0x6C4F 5520 bytes
font_01_sfnt_off00007ee9.bin
6e86c94dc6f00057f4c4709f97fb20af0ec2ea23db4b20231c51d935d2e130d6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EE9 10496 bytes