Malicious PDF — malware analysis report

Static analysis result for SHA-256 455cbe50a4cf1bb6…

MALICIOUS

PDF

44.8 KB Created: 2020-09-10 15:20:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 37627741555a7dfc7b5b4678732dfdad SHA-1: b289772d3c18a832383d43a23380f7ef7d8a7e71 SHA-256: 455cbe50a4cf1bb62da31395a16f875397e68b30b31b473a17fd75ad7f094ae8
152 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which point to a link farm designed to obscure malicious redirectors. One such redirector, 'https://ttraff.club/pify?keyword=video+show+lite+video+editor+apk', is explicitly flagged as malicious. The document body, though heavily obfuscated, contains references to the malicious URL and benign-looking PDF filenames, suggesting a lure for users to download a video editor. The ML classifier strongly supports the malicious nature of this PDF.

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.club/pify?keyword=video+show+lite+video+editor+apk
    • http://files.electropathi.com/uploads/1/3/1/4/131407353/jowura-veseno.pdf
    • http://lebujibil.athenastorm.org/uploads/1/3/2/7/132740405/8c7cf0b9de.pdf
    • http://refowasi.cgpto.org/uploads/1/3/1/3/131398036/wifejole.pdf
    • https://cdn.shopify.com/s/files/1/0428/6332/9446/files/purujifugevur.pdf
    • https://cdn.shopify.com/s/files/1/0432/1984/5278/files/68581021596.pdf
    • https://cdn.shopify.com/s/files/1/0431/8501/2900/files/standing_barbell_shoulder_press_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/0635/3823/files/7835011998.pdf
    • https://cdn.shopify.com/s/files/1/0429/9125/5713/files/jailbreak_iphone_5c_9._1.pdf
    • https://static.usrfiles.com/ugd/0a0016_98be44b743c64eda9e8816daab6c11be.pdf
    • https://static.usrfiles.com/ugd/9edd50_04d970a47d954246bccc973d19ac2d66.pdf
    • https://static.usrfiles.com/ugd/ea2f88_82847dd38dbe49c9a3e6939b140541ac.pdf
    • https://cdn.shopify.com/s/files/1/0437/4573/8903/files/axcel_papain_10000_usp_dosage_unifor.pdf
    • https://cdn.shopify.com/s/files/1/0434/3136/2725/files/english_to_tagalog_sentence_translation_apk.pdf
    • https://cdn.shopify.com/s/files/1/0463/3873/6290/files/24726259158.pdf
    • https://cdn.shopify.com/s/files/1/0433/5285/0586/files/witcher_bestiary.pdf
    • https://cdn.shopify.com/s/files/1/0435/3343/5029/files/children_s_video_songs_free_malayalam.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_off00005b4a.bin
ce9e7ad5cbac918cc74ae455556f9cec098d63077c441adc719b1b6ebc94b496		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B4A 5228 bytes
font_01_sfnt_off00006d24.bin
bdb716560c8af748acbb5a287988b31ee256bfd48a5f3dce75fdfa7c825c93e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D24 10152 bytes
font_02_sfnt_off00009009.bin
fb2fc76d2543962a218d25a88f370a2cd7e9f0ec7b2bada209548f03e17e6a50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9009 16264 bytes

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