Malicious PDF — malware analysis report

Static analysis result for SHA-256 16ac8a30838cf58e…

MALICIOUS

PDF

60.8 KB Created: 2020-07-30 21:13:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cac1b0c1d7ac251c88292f2b20b5b01c SHA-1: dfad9ac99079c02fe65a0229d10676b439e3ecf5 SHA-256: 16ac8a30838cf58ec4d923390df6758084568c3d3dabc66976a00bb9c545baec
162 Risk Score

Malware Insights

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

The sample is a PDF that contains numerous embedded links, many of which point to external PDF files hosted on Shopify. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically 'ttraff.cc', which is used in conjunction with a lure related to 'google docs pdf ocr'. This suggests a phishing or scam attempt designed to redirect users to malicious sites. No scripts were extracted, but the presence of malicious redirector links and a large number of external links strongly indicates a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=google+docs+pdf+ocr
    • http://files.tabithafitness.com/uploads/1/3/0/7/130775907/e08bb584e.pdf
    • http://files.bryangatescfi.com/uploads/1/3/1/4/131406781/lujufi_tizefa_tidapu_sunazuzem.pdf
    • http://files.dannyscholtze.com/uploads/1/3/0/9/130969636/bc93e4c6345.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/0129/6534/files/lavejoxofonusipunotamuxid.pdf
    • https://cdn.shopify.com/s/files/1/0432/5018/8443/files/zetowoturebenar.pdf
    • https://cdn.shopify.com/s/files/1/0437/6854/5442/files/betonafu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6259/9586/files/tekewuvixizobifazesimal.pdf
    • https://cdn.shopify.com/s/files/1/0430/8808/5143/files/daselibinuranenaxege.pdf
    • https://cdn.shopify.com/s/files/1/0440/3894/6981/files/jibisedizez.pdf
    • https://cdn.shopify.com/s/files/1/0432/3350/9534/files/kurigovelokudelarexogew.pdf
    • https://cdn.shopify.com/s/files/1/0430/2385/9873/files/97971301923.pdf
    • https://cdn.shopify.com/s/files/1/0431/9684/2142/files/votitiwunoba.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000b5e9.bin
759d0ba8bd8abadd55a1e76000a0b55a629946e355450bbe76c4c6d0b5e07da6		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB5E9 27124 bytes
font_00_sfnt_off0000835a.bin
0af56c4baa50d9e1c34228dcfc953d0cead548a4ddeff0606580f88081fbaec9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x835A 4696 bytes
font_01_sfnt_off0000936c.bin
f1f4ba937425a4a896797c2a5fff3f095a911e3da74c2c7ebd766169b1ddd082		 pdf-font-stream PDF embedded font (sfnt) at offset 0x936C 10108 bytes

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