Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c8cf6f6fe37424…

MALICIOUS

PDF

42.8 KB Created: 2020-08-20 18:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f238c628bde65d367eefa452bfa9df08 SHA-1: d6bef1365830a899c64e18461974ee3f30ee387d SHA-256: e4c8cf6f6fe374248118f9100d70d490ac507a1ad3b730df0e83dc68a6f17d8e
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary malicious redirector URL pointing to 'https://ttraff.com/pify?keyword=average+worksheet+for+grade+5+pdf'. The document body, though heavily obfuscated, also contains this URL and other links to Shopify-hosted PDFs, suggesting a lure to disguise malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is designed to redirect users to harmful 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.com/pify?keyword=average+worksheet+for+grade+5+pdf
    • http://files.andreaspeechpathology.com/uploads/1/3/1/3/131383386/353589.pdf
    • http://kejaru.bargersbargains.com/uploads/1/3/1/4/131407005/d4f311ce4.pdf
    • http://files.storytellingraven.com/uploads/1/3/1/4/131406507/vafizogofuw.pdf
    • http://jakenuvan.allsaints-madison.org/uploads/1/3/0/7/130739783/mofozinedupumu_posiretajozuno_zewuxa.pdf
    • https://cdn.shopify.com/s/files/1/0433/1651/0873/files/83730106532.pdf
    • https://cdn.shopify.com/s/files/1/0428/9200/1433/files/game_call_of_duty_android_apk_obb.pdf
    • https://cdn.shopify.com/s/files/1/0434/9113/1554/files/gukisuvuzowuvarepimap.pdf
    • https://cdn.shopify.com/s/files/1/0441/2496/2968/files/northwest_driving_school_homework_answers.pdf
    • https://cdn.shopify.com/s/files/1/0435/8311/1323/files/resorekewu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8125/2507/files/fuxekonufiwisix.pdf
    • https://cdn.shopify.com/s/files/1/0435/0771/2155/files/led_zeppelin_immigrant_song_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0438/5443/0368/files/juwavawesixofen.pdf
    • https://cdn.shopify.com/s/files/1/0429/5085/2762/files/juwowowali.pdf
    • https://cdn.shopify.com/s/files/1/0433/8260/3927/files/bopibubevi.pdf
    • https://cdn.shopify.com/s/files/1/0436/2820/0096/files/76408820421.pdf
    • https://cdn.shopify.com/s/files/1/0434/5892/0605/files/wuvale.pdf
    • https://cdn.shopify.com/s/files/1/0428/7853/3788/files/votusonojuzosubuveganes.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_off00006766.bin
c70b1077e01751bf355cbf0c4835b00ebce83b8d1e47323cc30a31ee1f9a5cee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6766 5600 bytes
font_01_sfnt_off00007a92.bin
2ca5b67c1cc88bd4b64420c8a200caab25da7f5c83f4a904ba8e19effa558b2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A92 10532 bytes

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