Malicious PDF — malware analysis report

Static analysis result for SHA-256 a999d08a4fb834ab…

MALICIOUS

PDF

46.7 KB Created: 2020-08-31 23:44:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbb6f22e1d9b0ef6c6949e32ba231b8c SHA-1: 883d56bf4fe8c9c507af6bc508afe0b934f03d65 SHA-256: a999d08a4fb834ab32208f57d76c45d1e7dbcdcc1515e87ce394787c5db3327e
128 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link that points to a URL designed to lure users with a search query. The document also exhibits characteristics of a link farm, embedding numerous external PDF links, many of which are hosted on Shopify. The presence of a 'download button' heuristic further suggests a deceptive workflow. The primary malicious IOC is the ttraff.ru redirector URL.

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=answer+sheet+sample+for+9th+class
    • https://cdn.shopify.com/s/files/1/0437/8984/4637/files/balun_canan_english.pdf
    • https://cdn.shopify.com/s/files/1/0431/8176/8872/files/xupavuxafokujik.pdf
    • https://cdn.shopify.com/s/files/1/0440/7758/0453/files/ffxiv_kagerou_overlay.pdf
    • https://cdn.shopify.com/s/files/1/0435/1423/2984/files/54842810164.pdf
    • https://cdn.shopify.com/s/files/1/0430/5331/8306/files/29670990379.pdf
    • https://cdn.shopify.com/s/files/1/0434/5102/3526/files/libros_sobre_el_anarquismo.pdf
    • https://cdn.shopify.com/s/files/1/0430/9732/5732/files/remokopifade.pdf
    • https://cdn.shopify.com/s/files/1/0429/0553/4620/files/ret_paladin_trinkets.pdf
    • https://cdn.shopify.com/s/files/1/0431/8789/6488/files/app_to_convert_webpage_to.pdf
    • https://cdn.shopify.com/s/files/1/0438/2749/5072/files/fourth_grade_english_grammar_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0435/2406/3392/files/pdf_xchange_viewer_spell_check.pdf
    • https://cdn.shopify.com/s/files/1/0435/9746/3714/files/organon_aristotle_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/3493/3408/files/fukikowewawenuwek.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/81603963226.pdf
    • https://cdn.shopify.com/s/files/1/0427/6633/6167/files/oblivion_guide.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_off000075b8.bin
93dadfaab7ea00df3870106c9c30cdf9cb2529947cd1d3c18ea074c485d74fbe
pdf-font-stream PDF embedded font (sfnt) at offset 0x75B8 5492 bytes
font_01_sfnt_off00008850.bin
d3a5f738175c2fb2d85ab185ea00773e1103f964fbb907ff2de448eb233869c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x8850 11536 bytes