Malicious PDF — malware analysis report

Static analysis result for SHA-256 9130cfc11a33d408…

MALICIOUS

PDF

44.8 KB Created: 2020-08-04 21:33:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f474122f40baaa5eddfead4196e1aa86 SHA-1: 5163b165052a54d107c0b510bbfa26e88293707b SHA-256: 9130cfc11a33d40848bd7e9e8fb1c5e40f852a48b00f8c6c480324b117eac999
152 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 identified as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm designed to lure users to malicious sites. The primary attack pattern involves redirecting 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/wb?keyword=ethics%20and%20law%20for%20school%20psychologists%20seventh%20edition%20pdf
    • http://files.developingfemaleleaders.com/uploads/1/3/1/4/131406800/4652894.pdf
    • http://files.g6environmentalequipment.com/uploads/1/3/1/6/131606268/gosadupuxubuzimujaro.pdf
    • http://files.tasc-group.com/uploads/1/3/0/9/130969418/1500612.pdf
    • http://files.jaquelinesnowe.com/uploads/1/3/2/3/132302876/paxirapofugini.pdf
    • http://files.homegrownhighways.com/uploads/1/3/2/8/132814826/dodoluwidinawuba.pdf
    • https://cdn.shopify.com/s/files/1/0434/1891/0870/files/loxaxagekikaj.pdf
    • https://cdn.shopify.com/s/files/1/0430/6858/8194/files/98697495037.pdf
    • https://cdn.shopify.com/s/files/1/0437/9816/7709/files/85381015122.pdf
    • https://cdn.shopify.com/s/files/1/0437/8106/2805/files/96752566205.pdf
    • https://cdn.shopify.com/s/files/1/0430/9981/6090/files/93643338247.pdf
    • https://cdn.shopify.com/s/files/1/0436/1394/6018/files/31828935126.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1549/files/flash_ray_gungeon.pdf
    • https://cdn.shopify.com/s/files/1/0433/0956/4068/files/vamolopugalexixa.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/96258555683.pdf
    • https://cdn.shopify.com/s/files/1/0437/8905/8209/files/historia_de_la_basilica_de_guadalupe.pdf
    • https://cdn.shopify.com/s/files/1/0428/4809/2323/files/59507741071.pdf
    • https://cdn.shopify.com/s/files/1/0431/5214/6587/files/9816259640.pdf
    • https://cdn.shopify.com/s/files/1/0429/8250/6647/files/15679903057.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_off000062ce.bin
6d8a2a3d9cdc461b82456364415ebd47ee6f7db3110ed8985f6ad51f2a25467a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62CE 5416 bytes
font_01_sfnt_off00007547.bin
83c8e4ab4435e16a1e86c17f24c745b304eab4685640dbcc52617fc7224cd2f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7547 10080 bytes
font_02_sfnt_off00009780.bin
ad623bc7c681097dfa1224999cf6cc6072d3ca9a137655dc1129b0261f0b357c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9780 4324 bytes

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