Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a3ff79fa9118760…

MALICIOUS

PDF

37.6 KB Created: 2020-08-30 06:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0d8578cb0a8b8f2d8ee465af8eb093a SHA-1: 749e33a50fffaf02f7e07aac44937a61cabe0ac8 SHA-256: 3a3ff79fa9118760d802e44cc9a3df583b6595bdd0481754bb85dbdf977358e4
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.cc'. Additionally, it exhibits a PDF link farm, with numerous external PDF links hosted on Shopify, suggesting an attempt at SEO poisoning or driving traffic to potentially malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, but the presence of the malicious redirector URL is the primary indicator of malicious intent.

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/wix?keyword=geisha+mp3+sementara+sendiri
    • https://cdn.shopify.com/s/files/1/0435/8150/5695/files/73410231419.pdf
    • https://cdn.shopify.com/s/files/1/0433/7870/4549/files/isometric_drawing_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0430/3932/6361/files/vezukixepakivigisolun.pdf
    • https://static.usrfiles.com/ugd/b8c837_50fb5fd106654119a8fcc2913c9d35d5.pdf
    • https://static.usrfiles.com/ugd/12745a_a992e41e6439423888297ba30d0914f7.pdf
    • https://static.usrfiles.com/ugd/b8c837_6cfe4baf039f425aab428be1e2946aa3.pdf
    • https://static.usrfiles.com/ugd/48d9a1_bf1dd36179c94674b37bec092bbc3679.pdf
    • https://cdn.shopify.com/s/files/1/0440/7263/2470/files/social_psychology_aronson_download.pdf
    • https://cdn.shopify.com/s/files/1/0439/8632/1566/files/sikopezijaxakulenovirat.pdf
    • https://cdn.shopify.com/s/files/1/0431/1315/2673/files/xazejotiloko.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zogubarekerebadopotuleju.pdf
    • https://cdn.shopify.com/s/files/1/0432/3665/5259/files/69593942761.pdf
    • https://cdn.shopify.com/s/files/1/0436/1771/4338/files/beethoven_fur_elise_notes.pdf
    • https://cdn.shopify.com/s/files/1/0432/9344/2208/files/sat_practice_test_2_no_calculator_answers.pdf
    • https://cdn.shopify.com/s/files/1/0433/0012/6880/files/kipenitibunibesasufugi.pdf
    • https://cdn.shopify.com/s/files/1/0429/0933/5715/files/xazupabizilowaburogaza.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_off000053e8.bin
9b983e0c2ceff2e590b609a9be2b83f39152e11d4840fdf8298913c82fd9db77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53E8 5364 bytes
font_01_sfnt_off000065f9.bin
1130f966728716d5982fb9ae904d74479f05e652888695928c8c7c86a342c06f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65F9 10380 bytes

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