Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a4360e056d48d63…

MALICIOUS

PDF

40.2 KB Created: 2020-08-25 13:56:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b626eb4af6f52194f07178886aa62dba SHA-1: f6926138309f021860c42509e6132501b8bbce20 SHA-256: 5a4360e056d48d63441e6555d7c53f724b8d97b5e5f560309b6c8758347e29a3
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or SEO poisoning attempt. One prominent URL, https://ttraff.com/pify?keyword=bisaya+bible+apk+free, is identified as a malicious redirector, likely serving as a lure for users seeking a Bible app. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to distribute potentially harmful content.

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.com/pify?keyword=bisaya+bible+apk+free
    • http://files.themagictraveler.com/uploads/1/3/2/7/132740553/jejoketinenez.pdf
    • http://bojeze.virtualmuseumofgeology.com/uploads/1/3/0/7/130775432/877c972.pdf
    • http://files.adorote.org/uploads/1/3/2/6/132695554/nevibumerexet.pdf
    • http://files.akrosdayunibers.com/uploads/1/3/0/8/130813461/7531819.pdf
    • http://wizovem.thetweedinfocus.com/uploads/1/3/2/6/132681504/risezimufikalam.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/4573/9941/files/marafozojezaxupepijozema.pdf
    • https://cdn.shopify.com/s/files/1/0429/0949/9551/files/pixezosutulisijegenebula.pdf
    • https://cdn.shopify.com/s/files/1/0431/9041/9620/files/75634054880.pdf
    • https://cdn.shopify.com/s/files/1/0435/9805/3539/files/46605114868.pdf
    • https://cdn.shopify.com/s/files/1/0428/3963/8179/files/61405519778.pdf
    • https://cdn.shopify.com/s/files/1/0431/3638/5175/files/bubafofetajo.pdf
    • https://cdn.shopify.com/s/files/1/0431/0925/3286/files/48814860117.pdf
    • https://cdn.shopify.com/s/files/1/0462/2123/0233/files/17325711947.pdf
    • https://cdn.shopify.com/s/files/1/0428/9685/1111/files/database_testing.pdf
    • https://cdn.shopify.com/s/files/1/0429/3279/7603/files/fast_android_emulator_for_low_end_pc.pdf
    • https://cdn.shopify.com/s/files/1/0449/2109/4311/files/59562868397.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_off00005aa4.bin
432d64bae7c58f2680a6a624002c6ca20f03ecb7c33edde2426f4b48e0aeef1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AA4 5248 bytes
font_01_sfnt_off00006c94.bin
34a747825985a68db0f8ec7fa8cda15fbf9436896c6105676f1b1923e71b1db3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C94 11708 bytes

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