Malicious PDF — malware analysis report

Static analysis result for SHA-256 a83de9e06ba2d8d8…

MALICIOUS

PDF

56.2 KB Created: 2020-08-08 12:09:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 381fa747d7c28d451dc58f07ad5c6609 SHA-1: e908def3ce640765b9f4bfe386154e0f4194fbb7 SHA-256: a83de9e06ba2d8d88b68ac4f1fd2feae0c0e48ab74767065bff97b571fddcef2
128 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one specifically identified as a malicious redirector. The document body, though partially corrupted, contains text related to 'free download' and includes the malicious URL. The presence of a 'download button' heuristic further supports the lure-based attack pattern. The primary malicious URL is https://ttraff.ru/pify?keyword=yayati+kadambari+pdf+free+download, which is used to redirect users.

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.
  • 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
  • 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.ru/pify?keyword=yayati+kadambari+pdf+free+download
    • http://tugup.pawsomewalksnj.com/uploads/1/3/1/6/131606490/jipolamudoborot_luwibezomiw_vofivotel_nubibeb.pdf
    • http://files.silvertonffa.com/uploads/1/3/2/6/132681823/8986c79ca.pdf
    • http://files.castronovobridal.com/uploads/1/3/1/6/131637224/rivalegipi_batufarikobi_guvazuz_bedamulovak.pdf
    • http://files.pyppewithandy.com/uploads/1/3/2/3/132302907/9f995.pdf
    • https://cdn.shopify.com/s/files/1/0438/3942/2624/files/southwest._com_check_in.pdf
    • https://cdn.shopify.com/s/files/1/0436/1850/0765/files/exercices_corriges_d_atomistique.pdf
    • https://cdn.shopify.com/s/files/1/0428/0696/8483/files/muxutufigiraxarix.pdf
    • https://cdn.shopify.com/s/files/1/0435/6728/4383/files/3701961569.pdf
    • https://cdn.shopify.com/s/files/1/0439/1544/4379/files/free_hidden_object_games_no_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/7098/0247/files/86365608670.pdf
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/muzubi.pdf
    • https://cdn.shopify.com/s/files/1/0434/9270/4408/files/gomaxisirimifagiror.pdf
    • https://cdn.shopify.com/s/files/1/0437/8283/2280/files/60721695691.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000b79f.bin
5ac4734ff8ec283b7e3b854f11428de0f63d23b4bde92961cc6dac9aa7020e71
decompressed-pdf-stream PDF FlateDecoded stream at offset 0xB79F 8468 bytes
font_00_sfnt_off00007494.bin
f081a705c7fe01f99fadee7971dc78a86b90b5db4fff2351aab481be911b94e6
pdf-font-stream PDF embedded font (sfnt) at offset 0x7494 5368 bytes
font_01_sfnt_off000086d9.bin
a4e21cafde7bd7024f17265e8e769c7aed28d6799b7e83f4e4e1ca54f81051b8
pdf-font-stream PDF embedded font (sfnt) at offset 0x86D9 15696 bytes