Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b0fca15f33f870…

MALICIOUS

PDF

52.8 KB Created: 2020-08-19 15:55:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 300222d910c91caca666043ab96287e2 SHA-1: b5ff56d2f46121debf74c6c840dd41fa31ca8ae7 SHA-256: 86b0fca15f33f870158cd4e452823ba0cfd3d7537fa03a41f2997f405f204bee
152 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though partially corrupted, contains text suggesting it is a worksheet, which is likely a lure. The primary malicious IOC is the redirector URL, which leads to further malicious 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.cc/pify?keyword=fraction+and+decimal+equivalents+worksheet
    • http://files.bradysbendhistoricalsociety.org/uploads/1/3/1/6/131636651/fewegejodolip.pdf
    • http://files.thecompanyofgoblins.com/uploads/1/3/1/4/131453574/vulax.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/wixet.pdf
    • https://cdn.shopify.com/s/files/1/0430/1602/8309/files/tajijamumoguranekaveroke.pdf
    • https://cdn.shopify.com/s/files/1/0428/8472/6943/files/xoxes.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/lamijoduruzi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9813/5966/files/nordvpn_coupon_reddit.pdf
    • https://cdn.shopify.com/s/files/1/0440/2325/1094/files/apostila_mecanica_automotiva_senai.pdf
    • https://cdn.shopify.com/s/files/1/0435/4965/5203/files/learn_autodesk_maya_2020.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5018/files/archery_fight_master_3d_game.pdf
    • https://cdn.shopify.com/s/files/1/0435/0207/6070/files/james_hadley_chase.pdf
    • https://cdn.shopify.com/s/files/1/0436/0532/8034/files/rivibozede.pdf
    • https://cdn.shopify.com/s/files/1/0428/6310/0070/files/43700931810.pdf
    • https://cdn.shopify.com/s/files/1/0434/0177/3212/files/browning_pistol_vault_manual.pdf
    • https://cdn.shopify.com/s/files/1/0452/4569/4112/files/basin_street_blues_piano.pdf
    • https://cdn.shopify.com/s/files/1/0436/7679/5030/files/toxicwap_music_videos_free.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006b49.bin
6b84d04bb56dbf75153d540a67348a5fdc6f8fd2800c0aeade816b0546f0e027		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B49 5476 bytes
font_01_sfnt_off00007dcb.bin
83cf74bb827de2a6a21f89a1600b30b0f125ed8d3374b080a9236411bf8e7344		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7DCB 14940 bytes
font_02_sfnt_off0000ad02.bin
d2bc5d64f86936baa8a535598807aaf818ee2625d35624d3e60802d888bb1e60		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD02 16456 bytes

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