Malicious PDF — malware analysis report

Static analysis result for SHA-256 a668729e40ac2c94…

MALICIOUS

PDF

52.8 KB Created: 2020-07-08 23:39:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eefc23b594dd2035cef888885dd60a42 SHA-1: 10fb1697724c1ebe43140a4f68631bf5a16922f5 SHA-256: a668729e40ac2c94e06bc3b65e1b1d8bd4843ad8455438a283c41d00095e2ff2
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files hosted on various domains. One critical heuristic identified a link to known malicious redirector infrastructure. The ML classifier strongly indicated maliciousness. The document body, though obfuscated, contains the text 'Variable aleatoria binomial pdf' and the malicious URL, suggesting a lure to a phishing or malware distribution site.

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/wb?keyword=variable%20aleatoria%20binomial%20pdf
    • http://files.pianolessonsbyjulie.com/uploads/1/3/1/3/131380868/59baef08.pdf
    • http://files.lifeandentertainment.com/uploads/1/3/2/7/132740398/rarewafoku.pdf
    • http://files.sanctuaries.org/uploads/1/3/1/8/131856443/jebegesogitesol.pdf
    • http://files.bishopgumbleton.com/uploads/1/3/1/3/131379371/tokasinipegog.pdf
    • http://files.lochgoin.com/uploads/1/3/1/6/131607239/gutexal.pdf
    • http://files.tonypalermolifecoach.com/uploads/1/3/1/4/131437740/eaf0f757.pdf
    • http://files.metalmeltdown.com/uploads/1/3/0/7/130775755/36f932b68a.pdf
    • http://files.paiboon.biz/uploads/1/3/1/4/131406762/1208977.pdf
    • http://files.leaderboxessentials.com/uploads/1/3/0/7/130775172/1436979.pdf
    • http://files.lorraineparishwriter.com/uploads/1/3/0/8/130873870/lobojixo.pdf
    • http://files.domaplasma.com/uploads/1/3/1/1/131164534/gifuwubumip.pdf
    • https://favajozavabi.files.wordpress.com/2020/06/bexiturewotavurejetoxuw.pdf
    • https://sewogadugabo.files.wordpress.com/2020/07/woselifegekevifaleranu.pdf
    • https://wejofokil.files.wordpress.com/2020/07/65555327658.pdf
    • https://zasajeloso685135112.files.wordpress.com/2020/06/95842604132.pdf
    • https://bivugon.files.wordpress.com/2020/06/daronawewotosuxo.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xiguxalenagidofivixonagez.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/17721531589.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/44603331863.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lufixupiz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/28650507632.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_off0000810f.bin
e7fcce69d1a25d106c6b0cacf9c7c496933c364ebfbc2c44e6150c50f5fb08d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x810F 3380 bytes
font_01_sfnt_off00008d2c.bin
0e393c1fb54619a370bfc525f3626551a78f55773a62debe98ec3bdbd8c15bd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D2C 4904 bytes
font_02_sfnt_off00009db0.bin
00a7adeb6f8514c20ad6461638cd09876a7c0449101693c203d8778798e44f48		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9DB0 11880 bytes

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