Malicious PDF — malware analysis report

Static analysis result for SHA-256 d72c4a6d50ce2547…

MALICIOUS

PDF

46.1 KB Created: 2020-08-20 18:01:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11f4047458a801fda8c8ed76fe761384 SHA-1: 06f24d11fcbdd41a8e25f30247e12e5c256dd7a8 SHA-256: d72c4a6d50ce2547f96d18aba8887f24e69ff9ac740bd09483ae317cb3c6aa56
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a deceptive title related to 'bass boosted app apk' and embeds a large number of external links. One of these links, https://ttraff.ru/pify?keyword=bass+boosted+app++apk, is identified as a known malicious redirector. The document's structure and embedded links strongly suggest a phishing or malware distribution attempt, leveraging a link farm to obscure the ultimate malicious destination.

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.ru/pify?keyword=bass+boosted+app++apk
    • http://files.the60four.com/uploads/1/3/0/9/130969185/nanaz.pdf
    • http://towebet.stoneofhopeyouth.org/uploads/1/3/1/4/131409236/2c949748ced5e.pdf
    • http://files.heartlandchurchnetwork.org/uploads/1/3/2/8/132814387/a72f5b06681.pdf
    • http://files.terapiaregresiva.org/uploads/1/3/0/8/130814290/daradipi.pdf
    • http://files.wordsfailphotography.com/uploads/1/3/2/7/132712080/8370586c0.pdf
    • http://joyofandroid.com/best-bass-booster-apps-for-android/Once
    • https://cdn.shopify.com/s/files/1/0428/9980/0217/files/laboratory_diagnosis_of_entamoeba_histolytica.pdf
    • https://cdn.shopify.com/s/files/1/0431/2724/2906/files/misty_mountain_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0429/6802/3194/files/bawos.pdf
    • https://cdn.shopify.com/s/files/1/0435/3517/1738/files/agriculture_books_in_urdu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nimapudusakodinufuzexive.pdf
    • https://cdn.shopify.com/s/files/1/0428/3501/7895/files/screenshot_windows_xp_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/3174/6967/files/91297052565.pdf
    • https://cdn.shopify.com/s/files/1/0431/3199/4280/files/32444884907.pdf
    • https://cdn.shopify.com/s/files/1/0431/8956/7650/files/fufipipatulipotewoboto.pdf
    • https://cdn.shopify.com/s/files/1/0433/8299/7148/files/gentlemen_prefer_blondes.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_off00005eab.bin
14f0ff5a2667a274c33ebc067dc26a7ee10867294c90b8bef843c57258d15250		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EAB 5080 bytes
font_01_sfnt_off00006ff9.bin
5b5c096e212d4a2c2e2a195334ed0ef2833824f0c3e846d262425347e48705c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF9 11088 bytes
font_02_sfnt_off0000961d.bin
39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x961D 16092 bytes

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