Malicious PDF — malware analysis report

Static analysis result for SHA-256 8987858613657095…

MALICIOUS

PDF

56.4 KB Created: 2020-08-22 13:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 269c200e61f4a0f1e56583d88aee9595 SHA-1: 4f4f1a56d046978e949adf3ce87b80afe5ff683c SHA-256: 898785861365709586918a32932476eaee41ca9d4760e2c057c72144ced30bdd
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that matches the redirector heuristic. The presence of a PDF link farm further supports the malicious intent, likely to drive traffic to malicious sites.

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.cc/pify?keyword=belajar+membaca+tanpa+mengeja+buku+1
    • http://files.adventuresinfaith.us/uploads/1/3/1/4/131437513/tudowenute_vijerasokesi_jodisopis.pdf
    • http://files.matthewmixes.com/uploads/1/3/1/4/131437956/sivoru.pdf
    • https://cdn.shopify.com/s/files/1/0428/2194/3463/files/points_to_pixels.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49186839350.pdf
    • https://cdn.shopify.com/s/files/1/0438/8097/2456/files/amma_rajinama_movie_audio_songs_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/2687/3509/files/rerexiwujixabopafemesigi.pdf
    • https://cdn.shopify.com/s/files/1/0437/7663/9134/files/chrome_browser_apk.pdf
    • https://cdn.shopify.com/s/files/1/0428/9275/5111/files/wukinenitoderoru.pdf
    • https://cdn.shopify.com/s/files/1/0439/1193/8216/files/book_wings_of_fire.pdf
    • https://cdn.shopify.com/s/files/1/0430/9359/0167/files/11100752752.pdf
    • https://cdn.shopify.com/s/files/1/0430/1094/9273/files/revised_schedule_6_balance_sheet_format.pdf
    • https://cdn.shopify.com/s/files/1/0435/5352/1823/files/sewaluben.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009f55.bin
27e6b5f58a55c26f12eedb864273e7692640387abf9531a3ac401c7a9d8e5a28
pdf-font-stream PDF embedded font (sfnt) at offset 0x9F55 5456 bytes
font_01_sfnt_off0000b1d9.bin
8549594f5a7d7706c7c37ddcb46318bae1ffc828af519880b577b61b56443320
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1D9 10120 bytes