Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa784c8e007dc5b9…

MALICIOUS

PDF

43.4 KB Created: 2020-08-24 03:45:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 34077addbe795d769a60b4f656c88ecd SHA-1: 52316a7dae122c1fed25e49ab736a3ef11c1e4a7 SHA-256: aa784c8e007dc5b9d7bc2418f1b2ea618b4e8764e3e21940cc84955698a43e18
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a mass of external links, many pointing to Shopify domains, but one critical link redirects to 'ttraff.cc', a known malicious redirector. The document body, though heavily obfuscated, contains the string 'app lock fingerprint pro apk' and the malicious redirector URL, suggesting a lure to download potentially unwanted or malicious software. The ML classifier also strongly indicated maliciousness.

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=app+lock+fingerprint+pro+apk
    • http://famuku.mkgcleveland.com/uploads/1/3/2/7/132740480/binojosug.pdf
    • https://cdn.shopify.com/s/files/1/0439/0230/4408/files/blank_bingo_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0427/7266/0390/files/44464174617.pdf
    • https://cdn.shopify.com/s/files/1/0463/4571/5873/files/appvalley_android_online.pdf
    • https://cdn.shopify.com/s/files/1/0448/4261/4945/files/chapter_10_capital_budgeting_techniques_solutions_gitman.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44240048578.pdf
    • https://cdn.shopify.com/s/files/1/0437/3400/7973/files/nujonoxisujib.pdf
    • https://cdn.shopify.com/s/files/1/0431/8350/5570/files/knicks_vs_warriors.pdf
    • https://cdn.shopify.com/s/files/1/0431/7249/5519/files/57724442829.pdf
    • https://cdn.shopify.com/s/files/1/0430/1389/8403/files/jepidenesinafixagup.pdf
    • https://cdn.shopify.com/s/files/1/0438/7792/5019/files/2383905300.pdf
    • https://cdn.shopify.com/s/files/1/0431/6862/8890/files/bubba_s_33_menu.pdf
    • https://cdn.shopify.com/s/files/1/0428/6241/1935/files/comparing_rational_and_irrational_numbers_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/8597/8018/files/creep_on_me_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0431/7554/2950/files/fejitigigeka.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_off0000682b.bin
00a2e69e74bf04d6fa3ebcd3cdb772a3d6882914c809edc10bce405917b308e8
pdf-font-stream PDF embedded font (sfnt) at offset 0x682B 5060 bytes
font_01_sfnt_off0000796e.bin
61588587127785e28ffcab40fb8d656950a6707daaf62d855bc5a900940bc5e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x796E 12792 bytes