Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ceb632880393e93…

MALICIOUS

PDF

71.1 KB Created: 2020-08-17 11:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86de59bfa624454e5d91034dba0fc188 SHA-1: 470004b024c4654c75d1991ad766af62cd1418ed SHA-256: 5ceb632880393e93ec907870ccfa514317cd02f531b219202879b76add23e336
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm and a specific redirector URL that is flagged as malicious. The document body, though heavily obfuscated, contains text related to bypassing device security ('samsung j250f frp bypass apk') and a URL that appears to be part of a SEO link farm designed to attract users searching for such bypass methods. The presence of a download button lure further supports a malicious intent to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=samsung+j250f+frp+bypass+apk
    • http://files.floridaflightsolutions.com/uploads/1/3/1/3/131381480/mogabopujomirewafu.pdf
    • http://files.machinetoolsrebuilt.com/uploads/1/3/1/4/131483143/riboxozidozi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0437/8358/5949/files/suffixes_esl.pdf
    • https://cdn.shopify.com/s/files/1/0433/6926/7354/files/jimuronujibamopoborow.pdf
    • https://cdn.shopify.com/s/files/1/0430/7232/3737/files/70664596119.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/imus_net_worth.pdf
    • https://cdn.shopify.com/s/files/1/0430/9159/1317/files/ferasid.pdf
    • https://cdn.shopify.com/s/files/1/0448/3697/8849/files/hebrew_alphabet_pronunciation.pdf
    • https://cdn.shopify.com/s/files/1/0429/7680/5018/files/nevadubegogixukade.pdf
    • https://cdn.shopify.com/s/files/1/0437/3102/6071/files/risk_management_books.pdf
    • https://cdn.shopify.com/s/files/1/0433/7316/6744/files/dulazurolif.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nebisineseboji.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5206/files/gejudadepojixin.pdf
    • https://cdn.shopify.com/s/files/1/0430/9745/6801/files/gopeboludefolusifojowulo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2936/3878/files/70433391802.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d257.bin
3ee2ae7d0a637d23849a6d05dcf44e3bc3596331be1f45ef506252a197905e99		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD257 6072 bytes
font_01_sfnt_off0000e6f9.bin
1563343d3b05a3f88137589bb8ec29d1bc062648d6f8bb9cc8833d82d20e46c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F9 12792 bytes

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