Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e5fcb1670a81b9c…

MALICIOUS

PDF

39.2 KB Created: 2020-08-10 03:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f18d0721256013bc91b39b4ac08d5292 SHA-1: e1437295bd02702677975de2592e758fed6b407f SHA-256: 5e5fcb1670a81b9c39ab40f5beb0a6d1cad1b1884144ae87e8f349de06161515
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though obfuscated, contains text suggesting it is a lure for "Pathology mcq with answers pdf". The primary malicious URL, https://ttraff.cc/pify?keyword=pathology+mcq+with+answers+pdf, is likely used to redirect users to further malicious content or phishing pages. The large number of links to external PDFs suggests an attempt to manipulate search engine results or distribute malware through a link farm.

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=pathology+mcq+with+answers+pdf
    • http://files.huron-athletics.org/uploads/1/3/1/3/131382395/wisipuz.pdf
    • http://files.vibrantabasolutions.com/uploads/1/3/1/4/131482962/fugamoliboxavuso.pdf
    • http://files.victoria13gla.ca/uploads/1/3/1/0/131070722/4c117c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/7872/0414/files/42946068368.pdf
    • https://cdn.shopify.com/s/files/1/0431/9094/3902/files/pizivilobavewavuwas.pdf
    • https://cdn.shopify.com/s/files/1/0431/5915/8938/files/70312043280.pdf
    • https://cdn.shopify.com/s/files/1/0436/5670/8254/files/holt_physical_science_interactive_textbook_answers.pdf
    • https://cdn.shopify.com/s/files/1/0438/6645/6224/files/40373452662.pdf
    • https://cdn.shopify.com/s/files/1/0428/2833/3219/files/pifodugepopimapu.pdf
    • https://cdn.shopify.com/s/files/1/0450/9345/3987/files/cervical_cancer_statistics_worldwide_2020.pdf
    • https://cdn.shopify.com/s/files/1/0432/5657/8212/files/37088975503.pdf
    • https://cdn.shopify.com/s/files/1/0432/4645/2899/files/65609245904.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8863/files/22687946918.pdf
    • https://cdn.shopify.com/s/files/1/0431/5388/3293/files/42290689539.pdf
    • https://cdn.shopify.com/s/files/1/0431/8704/4510/files/89378565270.pdf
    • https://cdn.shopify.com/s/files/1/0437/0425/4615/files/capitales_del_mundo_por_continentes.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d1b.bin
d925291c1ba598ec24f86c71c851536321b26ed2d9c2aece90347756cda6f420		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D1B 5680 bytes
font_01_sfnt_off0000604e.bin
7ce40300eeba3f26661a41b48198f99981767e32a23ff36d06336a73ab0469a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x604E 9820 bytes
font_02_sfnt_off000081d8.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81D8 4324 bytes

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