Malicious PDF — malware analysis report

Static analysis result for SHA-256 adcaa11876210df0…

MALICIOUS

PDF

171.4 KB Created: 2020-09-01 02:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e91cd58b4c8b7c9754cb0d1aacb46c8d SHA-1: 3566a92bbed7fd4697f7c076269b1a9d4443a0a6 SHA-256: adcaa11876210df0bd33f4afc636f814bd8550281b69f75749f98841bf6630da
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/wix?keyword=cervical+cytology+screening+guidelines'. This URL is the primary indicator of malicious intent, likely serving as a lure to a phishing or malware distribution site. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same URL, reinforcing its role in the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 3

  • 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.
  • 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/wix?keyword=cervical+cytology+screening+guidelines
    • https://cdn.shopify.com/s/files/1/0432/5956/0086/files/62707656833.pdf
    • https://cdn.shopify.com/s/files/1/0437/7310/0184/files/dragon_ball_z_games_android_free.pdf
    • https://cdn.shopify.com/s/files/1/0437/2201/4870/files/44573230722.pdf
    • https://cdn.shopify.com/s/files/1/0428/5415/4406/files/bleacher_report_nfl_picks_week_9.pdf
    • https://cdn.shopify.com/s/files/1/0435/7760/6303/files/photo_editor_mod_apk_free.pdf
    • https://cdn.shopify.com/s/files/1/0435/7334/6463/files/dora_colorado_jurisprudence_exam_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0429/6045/3785/files/lijetaviwibep.pdf
    • https://cdn.shopify.com/s/files/1/0432/6971/8182/files/download_phn_mm_chuyn_sang_nh.pdf
    • https://cdn.shopify.com/s/files/1/0437/0658/1147/files/jakekidojimanekuvixa.pdf
    • https://static.usrfiles.com/ugd/cafc24_b353867787554a819ae7461bfa4612bf.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f39915c136e4678a61ff3558f66f450.pdf
    • https://static.usrfiles.com/ugd/63d3ad_ccaa1580f7c74d3f85d864da873e8cb4.pdf
    • https://static.usrfiles.com/ugd/3ab5ed_ab33a22c03e1423ca7d6b8856f6c58c1.pdf
    • https://static.usrfiles.com/ugd/a2d007_d55f852eaf774ef395c04fe0d3390afb.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_off000239de.bin
123af202e9875b2a281e265f96598fba23ad9b76b5c83726d9a346b9a15cf883		 pdf-font-stream PDF embedded font (sfnt) at offset 0x239DE 5176 bytes
font_01_sfnt_off00024b92.bin
d9a686e99bc476a42eb601bb38e2f7cc04cf013708938748fd99c665b49bfe2f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x24B92 16204 bytes
font_02_sfnt_off00027cc6.bin
2173a1880e9f774f759393e7d0d28dda91d04d8a3eae6bea41b822770b343b90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x27CC6 16060 bytes
font_03_sfnt_off0002915d.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2915D 4324 bytes

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