Malicious PDF — malware analysis report

Static analysis result for SHA-256 87ae61f1be41f32f…

MALICIOUS

PDF

46.2 KB Created: 2020-08-25 11:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 42cf496425293bfd3d365a5414328ad5 SHA-1: a25fdbafd5cd8ac06582768c7b83ffcd8c697bb9 SHA-256: 87ae61f1be41f32f1dfd862ddb2220c9117b1c6a99db09136ec19d9b4adf957e
128 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text referencing '8d audio converter apkpure' and a URL that matches the redirector link. This suggests a social engineering lure to trick users into downloading potentially malicious content. The presence of numerous other PDF links, many hosted on Shopify, further indicates a link farm or SEO poisoning attempt to distribute the malicious lure.

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.cc/pify?keyword=8d+audio+converter+apkpure
    • http://mujujija.springgatemello.com/uploads/1/3/1/4/131406744/tinagekepebaforeg.pdf
    • http://files.caspergpaa.org/uploads/1/3/1/4/131406077/477d5fb2445f.pdf
    • http://surid.barberbeautysupply.net/uploads/1/3/1/4/131482975/793795.pdf
    • http://files.tkcreations101.com/uploads/1/3/0/9/130969371/1094969.pdf
    • http://files.shenfieldlearning.com/uploads/1/3/1/0/131070572/22e5c69acb4a.pdf
    • https://cdn.shopify.com/s/files/1/0434/7140/5222/files/27491238699.pdf
    • https://cdn.shopify.com/s/files/1/0431/2724/2914/files/prime_time_math_book_6th_grade.pdf
    • https://cdn.shopify.com/s/files/1/0429/2640/7833/files/dragonballz_budokai_tenkaichi_2_cheats.pdf
    • https://cdn.shopify.com/s/files/1/0438/8611/7019/files/lenilula.pdf
    • https://cdn.shopify.com/s/files/1/0435/9802/0767/files/laxabidamaba.pdf
    • https://cdn.shopify.com/s/files/1/0433/4285/6344/files/91499810877.pdf
    • https://cdn.shopify.com/s/files/1/0440/5261/1222/files/waste_management_practices_john_pichtel_free_download.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00007903.bin
59b9034c66fe4fd696b8e90b4bd368506e5a7309d2a178a212ee3f0178e3ddba
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7903 21464 bytes
font_00_sfnt_off000044a8.bin
ad3e6c151e0c17010994411dbe0e8726a66b7368169dd33625eeb3e36169cd23
pdf-font-stream PDF embedded font (sfnt) at offset 0x44A8 4964 bytes
font_01_sfnt_off0000558b.bin
e9854570cf73e1a7a83f8cb6d2aa8bb0c84c0eb433619efde331a731fc0405a7
pdf-font-stream PDF embedded font (sfnt) at offset 0x558B 10292 bytes
font_03_sfnt_off00009db2.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
pdf-font-stream PDF embedded font (sfnt) at offset 0x9DB2 4324 bytes