Malicious PDF — malware analysis report

Static analysis result for SHA-256 71cf6847c3541404…

MALICIOUS

PDF

43.7 KB Created: 2020-08-20 01:13:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f28fa89cad0f93670e64414d8a3c7b1 SHA-1: 2e2af840a98b4d256ec3668c69cafbae11b6d605 SHA-256: 71cf6847c35414041b05476c2768298fa0cc62a8f72b172f7499aecfbc70c535
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service known to host malicious content. The document body itself contains a reference to the redirector URL, suggesting an attempt to lure users to malicious sites under the guise of providing template resources. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • 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=bootstrap+template+simple+buttons
    • http://files.inseason.info/uploads/1/3/0/7/130775071/pagur.pdf
    • http://files.morrowworldpost.com/uploads/1/3/0/8/130874457/tazozusakulisag_pofuma.pdf
    • http://files.structuredevelopmentnw.com/uploads/1/3/1/0/131071145/nobolazow-tuxoxugep-mekazazufobi-puseju.pdf
    • http://files.mreshistory.com/uploads/1/3/1/3/131381006/fosotodole-korinotanum-mufup-nowomopudosix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/1034/2564/files/67034203766.pdf
    • https://cdn.shopify.com/s/files/1/0435/0250/2054/files/install_github_windows.pdf
    • https://cdn.shopify.com/s/files/1/0431/5217/9364/files/ba_1st_year_english_book.pdf
    • https://cdn.shopify.com/s/files/1/0431/0630/4162/files/73894111824.pdf
    • https://cdn.shopify.com/s/files/1/0429/1058/0903/files/mowiwozaw.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/66922869277.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/roy_stuart_glimpse.pdf
    • https://cdn.shopify.com/s/files/1/0433/4216/8218/files/sexarakadifibovobunelu.pdf
    • https://cdn.shopify.com/s/files/1/0432/5661/0979/files/39292256619.pdf
    • https://cdn.shopify.com/s/files/1/0428/1879/7724/files/josogim.pdf
    • https://cdn.shopify.com/s/files/1/0438/3673/5645/files/74549360964.pdf
    • https://cdn.shopify.com/s/files/1/0440/9124/4696/files/18743373236.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006dd6.bin
5f29706ee8d865ef8422080cb62accc1a695efaffd48352eb3460e7b652026f9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD6 5152 bytes
font_01_sfnt_off00007f40.bin
cdcf7e372e91ad40d8471b17d6c19da8c9878236ec08120d848e6ec0c4a1d975
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F40 10056 bytes