Malicious PDF — malware analysis report

Static analysis result for SHA-256 819a8d346df0f601…

MALICIOUS

PDF

41.1 KB Created: 2020-09-01 06:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10728c96f32ceca7f9c63616a5086cac SHA-1: 0c13d84bb616efa1ac85102b284663994a69be5a SHA-256: 819a8d346df0f6013c5dfd63711fda72b5f893deefeb8fafe09e0b98cd681efd
152 Risk Score

Malware Insights

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

The PDF contains a prominent link that redirects to a malicious URL, identified as a redirector. The document body, though heavily obfuscated, contains the text 'Bookkeeping checklist template' and the malicious URL, suggesting a lure to trick users into clicking the link. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' confirms the presence of a link to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness.

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=bookkeeping+checklist+template
    • https://cdn.shopify.com/s/files/1/0428/7476/5475/files/43637991057.pdf
    • https://cdn.shopify.com/s/files/1/0439/1033/2571/files/100_most_common_idioms.pdf
    • https://cdn.shopify.com/s/files/1/0440/8888/5413/files/49132676609.pdf
    • https://cdn.shopify.com/s/files/1/0440/5959/0806/files/bosque_las_categorias_gramaticales.pdf
    • https://cdn.shopify.com/s/files/1/0429/8499/7025/files/48774544908.pdf
    • https://cdn.shopify.com/s/files/1/0458/5996/3033/files/59500925270.pdf
    • https://cdn.shopify.com/s/files/1/0437/9718/4673/files/2012_buick_regal_gs_manual_review.pdf
    • https://cdn.shopify.com/s/files/1/0438/2906/7938/files/puzevovugaxurojeritamezuw.pdf
    • https://static.usrfiles.com/ugd/26938b_7df8cdfa7cd54fc2b8d58e8e2e554afa.pdf
    • https://static.usrfiles.com/ugd/d54300_42e80c383b5640eb92ee6042543699b0.pdf
    • https://static.usrfiles.com/ugd/b6bf5b_e32afc81485a448889445f462a3dbbd9.pdf
    • https://static.usrfiles.com/ugd/e73fea_f44c7d264ba24325984000249aeeddf5.pdf
    • https://static.usrfiles.com/ugd/b8c837_7fc11c3a676642a194389e4fea123cbc.pdf
    • https://static.usrfiles.com/ugd/3bca44_6185d75c1fa845fbbc9f077bb862835b.pdf
    • https://static.usrfiles.com/ugd/01bc73_2d80840d4d1f4c29a2341231c4f37eec.pdf
    • https://static.usrfiles.com/ugd/b8c837_1d00b330d89e41bbb84a22664eb146c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_af3d921be24f4dfd8509b19225a31eba.pdf
    • https://static.usrfiles.com/ugd/bb13a2_baa89a80e18b455ca66aca4bdb09279d.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006303.bin
598c5f90fdd46b6e803e1a41bc72f96d3051df1ed6bcfc183cb1dcf4b1003bbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6303 5364 bytes
font_01_sfnt_off0000752c.bin
08282a92f4538a66fa16628149951e3e36b6db0391bb23537714912ab102a739		 pdf-font-stream PDF embedded font (sfnt) at offset 0x752C 9972 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.