Malicious PDF — malware analysis report

Static analysis result for SHA-256 f483b776cfd04b14…

MALICIOUS

PDF

42.0 KB Created: 2020-08-30 06:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4f7fc4ee8cee260536a2823e49bb421 SHA-1: bcb2865bc78cca96a44939560932c11bfb0056f6 SHA-256: f483b776cfd04b14f8163e1cfb4d06fa4fea0d641b46e0085152fbfb076433b2
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1059.001 PowerShell

The PDF contains a prominent link that, when clicked, redirects to a malicious URL identified as a redirector. The document body, though heavily obfuscated, contains the text 'Hand and foot score sheets download' and the malicious URL, suggesting a social engineering lure. The presence of numerous external PDF links, many pointing to Shopify, indicates a link farm designed to improve search engine ranking for the malicious redirector.

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/wix?keyword=hand+and+foot+score+sheets+download
    • https://cdn.shopify.com/s/files/1/0433/3764/6245/files/solid_carbide_cutting_tools.pdf
    • https://cdn.shopify.com/s/files/1/0428/2771/0630/files/5197489673.pdf
    • https://cdn.shopify.com/s/files/1/0432/7188/0870/files/57890305209.pdf
    • https://cdn.shopify.com/s/files/1/0431/0263/4148/files/my_french_lab.pdf
    • https://static.usrfiles.com/ugd/b8c837_00a9562b2044405db30aef232bb75b87.pdf
    • https://static.usrfiles.com/ugd/b8c837_42f546c2cd7845dba95f46381acebb02.pdf
    • https://static.usrfiles.com/ugd/d2751c_e3e45516ab66410e8571400b61ff9920.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd358dfc61e540668b4d35995bce5230.pdf
    • https://static.usrfiles.com/ugd/b8c837_8e6b398d058943dbb13f6b901c17a748.pdf
    • https://static.usrfiles.com/ugd/b8c837_e96821df49074073aed284cbbc37b7f2.pdf
    • https://static.usrfiles.com/ugd/d4da64_77adec0a401342368b9cc75318abb1b4.pdf
    • https://cdn.shopify.com/s/files/1/0451/0393/9749/files/lojixelepiseluzabolobeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/5434/2044/files/android_app_uninstall_button_disabled.pdf
    • https://cdn.shopify.com/s/files/1/0431/5666/8573/files/33143260603.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rowogumidakedodovejizana.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/
    • https://static.usrfiles.com/ugd/b8c837_e96821df49074073aed284c

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065ce.bin
051edce9ecf8a9c68a49d7786b5406cdc2ee2bc7505f78bf13ea6a1355113e47
pdf-font-stream PDF embedded font (sfnt) at offset 0x65CE 5160 bytes
font_01_sfnt_off0000775e.bin
7bc32caa03f00b1fc8abd791fa833d7c6aaf55e0a28d410dfb38c51ef0987931
pdf-font-stream PDF embedded font (sfnt) at offset 0x775E 10544 bytes