Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa87d12fd80a083…

MALICIOUS

PDF

46.4 KB Created: 2020-08-31 22:14:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 63217743b83a15e5c366ab7c01904662 SHA-1: a9ff77835b90e6ae668c0cb21e5a9453f236509b SHA-256: 3aa87d12fd80a08312d01e8a9bb7d521e01c5f4ac6b36e67bf82fabd9b9a3415
120 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for PDF_MALICIOUS_REDIRECTOR_LINK indicating redirection to known malicious infrastructure via the URL https://ttraff.cc/wix?keyword=variance+analysis+template. Another critical heuristic, PDF_SEO_LINK_FARM, confirms the presence of a large number of external links, including one to cdn.shopify.com. The document body, though heavily obfuscated, contains references to the redirector URL and a Shopify URL, suggesting a lure to download further malicious content or visit phishing sites.

Heuristics 3

  • 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.
  • 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/wix?keyword=variance+analysis+template
    • https://cdn.shopify.com/s/files/1/0432/9357/3288/files/silasosovuxir.pdf
    • https://cdn.shopify.com/s/files/1/0429/5865/1545/files/roblox_aimbot_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/1358/7623/files/4079499137.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/89702154679.pdf
    • https://cdn.shopify.com/s/files/1/0447/9103/8118/files/abstract_nouns_in_english.pdf
    • https://cdn.shopify.com/s/files/1/0435/3458/1911/files/youtube_downloader_pc_app_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/9015/7474/files/ignou_ma_assignment_2018-_19_solved.pdf
    • https://cdn.shopify.com/s/files/1/0440/6591/5032/files/gta_ballad_of_gay_tony_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0429/5314/6527/files/piping_isometric_drawing_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0429/9263/1962/files/15619191385.pdf
    • https://cdn.shopify.com/s/files/1/0431/0115/9585/files/jowuwazijibokamab.pdf
    • https://cdn.shopify.com/s/files/1/0431/1095/7210/files/takefuxojarowinowibe.pdf
    • https://cdn.shopify.com/s/files/1/0431/5221/2128/files/71150129410.pdf
    • https://cdn.shopify.com/s/files/1/0438/1310/9917/files/rinosemidi.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_off00007709.bin
295aa0fffa053550d8760c5c6ea60976cc081800bf3f413630302338763b88fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7709 5148 bytes
font_01_sfnt_off0000887f.bin
78263c19390bb4f2e90ef4c98c003fb91e2b666cb602def6713f2a31ba22f4ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x887F 10580 bytes

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