Malicious PDF — malware analysis report

Static analysis result for SHA-256 928dba084e50cc3e…

MALICIOUS

PDF

50.0 KB Created: 2020-08-20 22:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e9a30833debb327b890879ab7901901b SHA-1: a4033c1a18f60dd90f0d0aa37d230a98b19e0b31 SHA-256: 928dba084e50cc3e0fea2fb89453b80618d10277ab556112f1c11798cf76c938
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one critical heuristic identifying it as a link farm pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the same suspicious URL found in the heuristics. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be the distribution of malicious links disguised within a PDF document.

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=beclomethasone+dipropionate+formoterol+fumarate+and+glycopyrronium+bromide
    • http://kojonip.newincomastires.com/uploads/1/3/1/4/131407668/13105d174c8b.pdf
    • http://files.mvkofcclubinc.org/uploads/1/3/2/6/132681901/zupuwudajiwaduv_viverubur.pdf
    • http://files.allyawl.com/uploads/1/3/1/8/131871467/826349.pdf
    • http://files.gaitwaychiropractic.com/uploads/1/3/0/7/130776490/253680.pdf
    • http://belajepor.excellentwoodturning.com/uploads/1/3/0/9/130969742/52afe.pdf
    • https://cdn.shopify.com/s/files/1/0434/1766/5703/files/tujixaworubefixisuv.pdf
    • https://cdn.shopify.com/s/files/1/0428/2020/6758/files/30388474226.pdf
    • https://cdn.shopify.com/s/files/1/0437/5288/2330/files/90903076831.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/soparuvuridove.pdf
    • https://cdn.shopify.com/s/files/1/0431/4651/0504/files/automation_tools_for_testing_android_applications.pdf
    • https://cdn.shopify.com/s/files/1/0432/5392/4004/files/asmaul_husna_dzikir.pdf
    • https://cdn.shopify.com/s/files/1/0432/8734/7364/files/banino.pdf
    • https://cdn.shopify.com/s/files/1/0435/3641/6936/files/93596887477.pdf
    • https://cdn.shopify.com/s/files/1/0436/5189/1358/files/astm_a1065.pdf
    • https://cdn.shopify.com/s/files/1/0437/4354/3450/files/hebrew_bible_genesis.pdf
    • https://cdn.shopify.com/s/files/1/0431/9353/2573/files/9_cu_sinif_alman_dili.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_off00006d19.bin
8fcd5143364ecad723998696fe8d8b15974c8ab3b69b73ae0ee961ca3c392702		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D19 5860 bytes
font_01_sfnt_off000080e0.bin
cfc531a3835cb59d4ea460ee3301c3ddcbee7c6b3e8d04a27f11eebc41cb52a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x80E0 10388 bytes
font_02_sfnt_off0000a49b.bin
298a059a47d04402a822539650cb20f422186273fa20e8de9e2ef64d066f24e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA49B 16160 bytes

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