Malicious PDF — malware analysis report

Static analysis result for SHA-256 a89d97b021fa9034…

MALICIOUS

PDF

33.3 KB Created: 2020-08-19 09:12:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11216449117e7ac9e2ec648980d5044a SHA-1: 4358eb5a8bb0925d08ea5f67be630e3734f4c4c7 SHA-256: a89d97b021fa9034bf19be071e6b516cb90ad5160836cd241d6d314780bbdd86
152 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector URL, suggesting it is designed to lead users to malicious content. The document body, though heavily obfuscated, contains the text 'telugu bible app apk' and the malicious URL, indicating a lure to download potentially harmful software. The ML classifier strongly flagged this PDF as malicious.

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=telugu+bible+app+apk
    • http://tinar.gillysplaceinkefalonia.co.uk/uploads/1/3/1/4/131408103/1604347.pdf
    • http://files.chinchilla3d.com/uploads/1/3/1/4/131409755/1181074.pdf
    • https://cdn.shopify.com/s/files/1/0427/4287/4278/files/34638657931.pdf
    • https://cdn.shopify.com/s/files/1/0433/8004/8037/files/86398127796.pdf
    • https://cdn.shopify.com/s/files/1/0439/0024/0024/files/9818710522.pdf
    • https://cdn.shopify.com/s/files/1/0436/3531/0752/files/select_all_google_drive.pdf
    • https://cdn.shopify.com/s/files/1/0432/6454/0840/files/cholesterol_diet_spanish.pdf
    • https://cdn.shopify.com/s/files/1/0433/1339/7924/files/release_of_liability_dmv_ca.pdf
    • https://cdn.shopify.com/s/files/1/0429/1775/7095/files/periodo_arcaico_superior.pdf
    • https://cdn.shopify.com/s/files/1/0431/6073/1803/files/25823005362.pdf
    • https://cdn.shopify.com/s/files/1/0428/3065/9751/files/automotive_technology_6th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nasodidupafulad.pdf
    • https://cdn.shopify.com/s/files/1/0451/3739/5866/files/calligraphy_practice_worksheets.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_off00004674.bin
951fd25015673051b5f50b53fd3b7f22561db1693ea6a4450192b4196249452e
pdf-font-stream PDF embedded font (sfnt) at offset 0x4674 4868 bytes
font_01_sfnt_off00005716.bin
de89393bdb3ad8755bef1a8e3c27a3873b184a1598fb431e731a8ae5f0623551
pdf-font-stream PDF embedded font (sfnt) at offset 0x5716 9896 bytes