Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1a8b18f2ce915f9…

MALICIOUS

PDF

48.5 KB Created: 2020-08-24 09:58:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2b2032423b01c7150ef744059f83c410 SHA-1: 2a11e689117b09fd7911e39e94f730b735a5dd13 SHA-256: d1a8b18f2ce915f9f13dc34dc150831003855dc907ae4dfabf8a220ebc58cd49
154 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and contains a link farm of numerous PDF files. One of the embedded links, 'https://ttraff.ru/pify?keyword=mahalaxmi+calendar+march+2019+marathi', points to a known malicious redirector. The document body contains garbled text and metadata suggesting it was generated by wkhtmltopdf, likely as a lure to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.ru/pify?keyword=mahalaxmi+calendar+march+2019+marathi
    • http://files.videointeractionproject.org/uploads/1/3/1/1/131163620/5d5e35837bebac6.pdf
    • http://files.ronnyalte.net/uploads/1/3/0/8/130813466/vexagekox-jubevoxit.pdf
    • https://cdn.shopify.com/s/files/1/0439/1131/5611/files/carruagem_de_fogo_partitura_piano.pdf
    • https://cdn.shopify.com/s/files/1/0437/2188/3816/files/mcaer_phd_cet_2018_answer_key.pdf
    • https://cdn.shopify.com/s/files/1/0436/5431/6197/files/20332005409.pdf
    • https://cdn.shopify.com/s/files/1/0447/3189/1861/files/the_odyssey_online.pdf
    • https://cdn.shopify.com/s/files/1/0435/1400/3610/files/17407728489.pdf
    • https://cdn.shopify.com/s/files/1/0441/1670/5432/files/b._ed_cet_previous_year_question_papers.pdf
    • https://cdn.shopify.com/s/files/1/0434/2353/1158/files/81545335469.pdf
    • https://cdn.shopify.com/s/files/1/0428/4976/3494/files/53661811160.pdf
    • https://cdn.shopify.com/s/files/1/0449/7666/8831/files/benufapuru.pdf
    • https://cdn.shopify.com/s/files/1/0441/0913/6024/files/tamil_hd_movies_tamilrockers_2019.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b4b.bin
9c93a1dbe3a8cf62bde4f6b0225a395bb23b5a9cb633774b250f2ac10f9ae7e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B4B 5232 bytes
font_01_sfnt_off00005cef.bin
57d93f12c2e146e1c6cdd5c1c3a09cd2eed58d6d42eabcd73689defbe55f682f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CEF 9688 bytes
font_02_sfnt_off00007e58.bin
ebd2804bff382343e08f6a42dc45f69f4e794c08b23908ae60ba78ededae74b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E58 16164 bytes
font_03_sfnt_off00009370.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9370 4324 bytes
font_04_sfnt_off0000a171.bin
8ca77f22653fa8dd73497e8daef176ee3d2e17100e5460cb27d0a51fd42ff936		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA171 5112 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.