Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fb276443b0505f6…

MALICIOUS

PDF

51.3 KB Created: 2020-08-14 19:20:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 333229c9c7807f20cdd1a7356c3d31bf SHA-1: 5df7c5506b156dbf39ea87d49dc67d8aee788ecc SHA-256: 6fb276443b0505f67dc62f84ae8d81a809bd5a0bcaebaaf287af7d39b4b016f9
162 Risk Score

Malware Insights

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

The PDF contains a link farm and a malicious redirector URL, indicating an attempt to lead users to harmful content. The document body, though heavily obfuscated, contains a URL that mirrors the malicious redirector, suggesting a social engineering lure related to 'custom ROMs'. The presence of numerous PDF links and a critical redirector finding strongly suggests a malicious intent to redirect users to malicious sites.

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=custom+rom+for+redmi+note+4x
    • http://files.blueoval.org/uploads/1/3/1/3/131378838/temit.pdf
    • http://fotipiku.hansroegelearchitect.com/uploads/1/3/2/8/132814930/df6e40b1b8.pdf
    • http://denexilug.voicescienceworks.org/uploads/1/3/0/9/130969723/taderu-jotonij-risusapes-dezode.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/6281/3084/files/xuripitakedufunizez.pdf
    • https://cdn.shopify.com/s/files/1/0433/4364/2773/files/16010719800.pdf
    • https://cdn.shopify.com/s/files/1/0429/8850/3203/files/93887119246.pdf
    • https://cdn.shopify.com/s/files/1/0430/9932/4580/files/82591942041.pdf
    • https://cdn.shopify.com/s/files/1/0434/5957/5958/files/moodle_luis_de_camoes.pdf
    • https://cdn.shopify.com/s/files/1/0434/3064/1826/files/fozemirakevovutowunup.pdf
    • https://cdn.shopify.com/s/files/1/0439/1242/9723/files/gufopexemiwi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6826/8456/files/40164873253.pdf
    • https://cdn.shopify.com/s/files/1/0430/3149/4810/files/fetepiximeluvebujegape.pdf
    • https://cdn.shopify.com/s/files/1/0433/4157/8399/files/life_science_lab_manual_answers.pdf
    • https://cdn.shopify.com/s/files/1/0429/3335/4659/files/jipapugonabinizan.pdf
    • https://cdn.shopify.com/s/files/1/0439/8986/0510/files/higher_category_theory.pdf
    • https://cdn.shopify.com/s/files/1/0429/1523/3948/files/17337520767.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008153.bin
9676c66e855e6017d6242c737bde8cc13420adc99d36ae8237d18b8e01dbe709		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8153 3196 bytes
font_01_sfnt_off00008cb7.bin
6029ba0ecaef51b679a22f5b281cccd3d8bbf9d1163888cbd0b7beefa3a9f373		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB7 4872 bytes
font_02_sfnt_off00009d40.bin
25facad1ffaee81918a7f8871ce7ff904c902d742ab3f95c85066484aa739b1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D40 10128 bytes

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