Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e6b1d581a559b1d…

MALICIOUS

PDF

54.9 KB Created: 2020-08-20 23:17:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cdda9d2e7af2984009fc2bf29bc7ced9 SHA-1: 28f628d94cda77206d023d14174bafa69923a804 SHA-256: 3e6b1d581a559b1d94fc6419c6b84b132f02f868d5d595153307185a461b8f91
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a redirector service. The ML classifier strongly indicated maliciousness. The primary malicious URL identified is a redirector that likely leads to further malicious content. The document body itself contains garbled text and a reference to the malicious URL.

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=ambarsariya+film++hd
    • http://dupiri.aboutastraliancobbeagles.com/uploads/1/3/0/7/130775732/4954864.pdf
    • https://cdn.shopify.com/s/files/1/0440/0742/4158/files/xafujagobu.pdf
    • https://cdn.shopify.com/s/files/1/0434/7386/2821/files/47706810474.pdf
    • https://cdn.shopify.com/s/files/1/0435/3848/1311/files/campfire_song_song_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0443/8137/2582/files/2017_chevy_equinox_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/5693/8646/files/tikuviduwipitaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/3213/3278/files/tinkle_file.pdf
    • https://cdn.shopify.com/s/files/1/0444/4097/7574/files/temp_email_account.pdf
    • https://cdn.shopify.com/s/files/1/0439/4654/1211/files/read_archie_comics_online_free.pdf
    • https://cdn.shopify.com/s/files/1/0434/7065/1542/files/arduino_cnc_grbl_tutorial.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7650/files/wononenebat.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006959.bin
8e6dfc9e29f2f23083da9d9565215e2edc5d50284b7d58e618acffc26d55dc94
pdf-font-stream PDF embedded font (sfnt) at offset 0x6959 5380 bytes
font_01_sfnt_off00007b78.bin
dd73f37fee1877f074cb198f87e72b1e3f1fed2b5c6811e759e71e03fd8fcef3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B78 7452 bytes
font_02_sfnt_off000093a5.bin
a720e4060e4172cfd1eb4d7f4f08fcfe702abbe3dc9cbe862a458c40a222be70
pdf-font-stream PDF embedded font (sfnt) at offset 0x93A5 10472 bytes
font_03_sfnt_off0000b7bb.bin
929192443497d925e48e4fb0f7b9f1f297c888e62d4c4d065f6a0a3322c9d335
pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BB 16872 bytes