Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c413c039c65754f…

MALICIOUS

PDF

42.0 KB Created: 2020-08-09 00:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4aa868d2f3fba8296813c0cbd3477668 SHA-1: 8b37d31229470dad5f111d68c427c05afbce9116 SHA-256: 5c413c039c65754f814518d69ef5f6b71b99f07d04132e91fafa9108a518a0c7
154 Risk Score

Malware Insights

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

The PDF contains a link farm and a redirector to malicious infrastructure, disguised with a lure related to 'aged care award 2020 pdf'. The ML classifier strongly indicated maliciousness. The embedded URLs suggest the document is part of a phishing campaign aiming to redirect users to potentially harmful content.

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.com/pify?keyword=aged+care+award+2020+pdf
    • http://files.jenkeyte.com/uploads/1/3/1/4/131454696/kelejuzisufatogiki.pdf
    • http://files.alitheajosaphine.com/uploads/1/3/2/6/132695531/jagesaluwutobix.pdf
    • http://files.pa-di.dk/uploads/1/3/0/8/130813904/dc53324de28202.pdf
    • http://wokiti.hunterwrestling.com/uploads/1/3/0/8/130874359/xozojuzaz.pdf
    • http://files.bayareajunkhauling.com/uploads/1/3/1/3/131398386/1359e80d82ef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/4189/1238/files/81587133648.pdf
    • https://cdn.shopify.com/s/files/1/0433/9240/1573/files/60098750555.pdf
    • https://cdn.shopify.com/s/files/1/0427/8750/4294/files/silent_letters_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0437/0671/2219/files/gupigoram.pdf
    • https://cdn.shopify.com/s/files/1/0431/1724/8672/files/99470700967.pdf
    • https://cdn.shopify.com/s/files/1/0429/4836/2399/files/nerowakaje.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/how_to_install_packages_in_sublime.pdf
    • https://cdn.shopify.com/s/files/1/0434/3663/8369/files/77977898292.pdf
    • https://cdn.shopify.com/s/files/1/0440/9376/7832/files/gibbs_learning_by_doing.pdf
    • https://cdn.shopify.com/s/files/1/0430/8670/8885/files/loxufavorajaferut.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nakawefefaf.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_off000065b5.bin
4de1aae40c8717db68e260934a0799f7df56388bb1ad449b119c2b2536ede628
pdf-font-stream PDF embedded font (sfnt) at offset 0x65B5 5468 bytes
font_01_sfnt_off00007875.bin
bbd68a64d451ca2b8d6c56b85b8923fda119dcc4baf876ead7421292ad91265a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7875 10208 bytes