Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4deeb4f7adab0a5…

MALICIOUS

PDF

51.6 KB Created: 2020-08-10 00:59:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eada1211fcbf6725a828a58d66fb36a8 SHA-1: 2f7491875ed1165b5ddffbabd348e82a11f1fe39 SHA-256: c4deeb4f7adab0a56579428998f94e9a537b755ae45f10888e296415853c02b0
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure, directing users to 'https://ttraff.cc/pify?keyword=biblia+romaneasca+pdf'. This suggests the document is designed to trick users into visiting a malicious site under the guise of providing a PDF resource.

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=biblia+romaneasca+pdf
    • http://fugigesax.crystalsentwined.com/uploads/1/3/2/6/132681352/871983.pdf
    • http://files.rocketbetty.com/uploads/1/3/0/7/130739596/jofosotipogasukobu.pdf
    • http://files.decadehorribilus.com/uploads/1/3/2/6/132695994/054885579e2866.pdf
    • https://cdn.shopify.com/s/files/1/0435/8481/5259/files/aiims_bsc_nursing_entrance_exam_previous_year_question_papers.pdf
    • https://cdn.shopify.com/s/files/1/0432/9901/2766/files/94486591856.pdf
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/futaguxijerutoli.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kixekitigatozodevejale.pdf
    • https://cdn.shopify.com/s/files/1/0427/8976/5279/files/ronodinewinonutoxunoloz.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4465/files/75011119952.pdf
    • https://cdn.shopify.com/s/files/1/0433/5478/3893/files/the_starter_oxford_chinese_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0437/7224/8215/files/63353797583.pdf
    • https://cdn.shopify.com/s/files/1/0447/4968/4885/files/eric_tupper_introduction_to_naval_architecture.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007e90.bin
81df02c49a3476fae4fe8eefad7c3c3ef51203b2b4cc14aec72fccce83fd3b53
pdf-font-stream PDF embedded font (sfnt) at offset 0x7E90 5196 bytes
font_01_sfnt_off00009001.bin
341f97618318387a53a79c0e210f4d810049cd236d38d52a3147567ef4768eef
pdf-font-stream PDF embedded font (sfnt) at offset 0x9001 10672 bytes
font_02_sfnt_off0000b371.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c
pdf-font-stream PDF embedded font (sfnt) at offset 0xB371 4324 bytes