Malicious PDF — malware analysis report

Static analysis result for SHA-256 62855bf916eda078…

MALICIOUS

PDF

39.1 KB Created: 2020-08-09 15:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1d16b3196f2f79dc7ab4d9f2e25eaa76 SHA-1: b8c842dec6b0e0e502fd8b6bb40b10343e7bc716 SHA-256: 62855bf916eda0780d03d65eed8dda50ee0ff76e20e448b07da6385a7cc48948
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to potentially malicious redirectors or link farms. One prominent link, 'https://ttraff.cc/pify?keyword=calculus+early+transcendentals+11th+edition+pdf+free', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other links, suggesting a phishing or scam attempt to drive traffic to malicious sites under the guise of providing free educational materials.

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=calculus+early+transcendentals+11th+edition+pdf+free
    • http://files.galang-kangin.com/uploads/1/3/0/8/130814078/259e869.pdf
    • http://files.themessageofnabiisa.org/uploads/1/3/1/6/131606284/e5dd96afc57.pdf
    • http://files.wilcoxwellnessfitness.com/uploads/1/3/2/6/132681560/lefabuwubi-weziko-falase-tisev.pdf
    • http://files.heritagepumps.com/uploads/1/3/1/6/131606291/vimavunaz-potaviv.pdf
    • http://files.vchschool.org/uploads/1/3/1/4/131454950/rivibano_kavinexogotovap_musozujabigako.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/7959/6187/files/all_short_form_and_full_form_of_computer.pdf
    • https://cdn.shopify.com/s/files/1/0436/0932/5730/files/98612062861.pdf
    • https://cdn.shopify.com/s/files/1/0429/8915/8554/files/gujudofabeso.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/mofofuledezenededur.pdf
    • https://cdn.shopify.com/s/files/1/0437/1221/7241/files/pinoy_tambayan_123.pdf
    • https://cdn.shopify.com/s/files/1/0431/0505/8976/files/96364094975.pdf
    • https://cdn.shopify.com/s/files/1/0430/7881/1797/files/autocad_clip_frame.pdf
    • https://cdn.shopify.com/s/files/1/0440/0198/4662/files/active_and_passive_verbs.pdf
    • https://cdn.shopify.com/s/files/1/0431/2255/7082/files/kanusixopofogot.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/naxajapibukijivadet.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xibirinadinabamagumib.pdf
    • https://cdn.shopify.com/s/files/1/0429/4639/6326/files/27879072464.pdf
    • https://cdn.shopify.com/s/files/1/0437/7355/8935/files/fetal_development_week_by_week.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_off000059e1.bin
761767e256b6ae32d96257e8245bd6ba60b032582085e405b0f656ea79f9043e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59E1 5304 bytes
font_01_sfnt_off00006bec.bin
4c3b9a7af705936e610d8bd9e4c005674f44824de20e9261e920d15c2cee053b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6BEC 10264 bytes

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