Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ca3990e38c1acc7…

MALICIOUS

PDF

39.3 KB Created: 2020-08-13 04:09:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a47550d0e4ffc227689792294da80fab SHA-1: 3b84d33c5ed634b0c7b8f06931c65caab0612655 SHA-256: 0ca3990e38c1acc7b0ef08bc8df227845b4b71167fd237a63d2b135e980f690e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector, ttraff.com, which is likely used to obscure the final destination of the malicious payload. The PDF also contains a large number of links to other PDFs, suggesting a link farm or SEO poisoning attempt to improve search engine ranking for malicious content. The ML classifier strongly indicates maliciousness, and the overall structure points to a phishing or malware distribution attempt.

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=an+introduction+to+cardiovascular+physiology+levick+free+pdf
    • http://kudun.markbrayfineart.com/uploads/1/3/1/6/131606066/7316415.pdf
    • http://files.shinestudiohairsalon.com/uploads/1/3/1/8/131856380/f3e9d249461e.pdf
    • http://files.hunterhomeinspection.com/uploads/1/3/0/8/130814118/soxome-wajetegeze-varexezat-xejiwexerodizun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/7451/9191/files/quest_belief_system.pdf
    • https://cdn.shopify.com/s/files/1/0431/8999/3621/files/how_to_make_wax_in_little_alchemy.pdf
    • https://cdn.shopify.com/s/files/1/0438/4283/0496/files/article_370_and_35a_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/7044/5975/files/vtu_electronics_and_communication_engineering_syllabus.pdf
    • https://cdn.shopify.com/s/files/1/0432/6191/9396/files/guvavinilemevuwitiborej.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/31725161154.pdf
    • https://cdn.shopify.com/s/files/1/0446/7025/5267/files/micro_center_seattle.pdf
    • https://cdn.shopify.com/s/files/1/0434/6612/9574/files/83898016327.pdf
    • https://cdn.shopify.com/s/files/1/0430/7140/6241/files/kundalini_shakti_book.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/25322908130.pdf
    • https://cdn.shopify.com/s/files/1/0437/3826/7809/files/52423008639.pdf
    • https://cdn.shopify.com/s/files/1/0437/9371/1265/files/mesemokobi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2259/7800/files/free_offline_to_word_converter_software_download.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_off00004a56.bin
9c5ebfe72409b0e0d4422b7b0aecebf1549093ff20afd319d001c57b03d367b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A56 5516 bytes
font_01_sfnt_off00005d17.bin
8cbca9ee9d0972aa718e6807bee083071193feb57f395c7def60a963dbf4eee5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D17 10096 bytes
font_02_sfnt_off00007f96.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F96 4324 bytes

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