Malicious PDF — malware analysis report

Static analysis result for SHA-256 b15f36aae9e8af12…

MALICIOUS

PDF

62.2 KB Created: 2020-08-24 22:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 28b020f67ad178d7809f866e3ac20eb5 SHA-1: 571552a2073942419549cfcb05a9c4b99e4f1fb5 SHA-256: b15f36aae9e8af12cf29b87d42bdf1d2868fdb2abef277443c88b06e109385cc
154 Risk Score

Malware Insights

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

The PDF file contains a link farm with 22 external PDF links, many of which are SEO-optimized. One of the primary links directs to a known malicious redirector infrastructure at 'ttraff.cc'. The document body contains garbled text but also includes the target URL and a list of other PDF links, suggesting a social engineering lure to drive traffic to malicious sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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=share+chat+baby+photos++tamil
    • http://files.thewelltraveledteacher.com/uploads/1/3/1/3/131381048/tuxij.pdf
    • http://files.michaelbrownslawoffice.com/uploads/1/3/1/4/131406762/xajixolaxexojobegu.pdf
    • https://cdn.shopify.com/s/files/1/0454/7579/0998/files/best_accounting_book_for_beginners.pdf
    • https://cdn.shopify.com/s/files/1/0432/1257/0787/files/longman_academic_writing_series_2_answer.pdf
    • https://cdn.shopify.com/s/files/1/0440/6162/2437/files/aircraft_structures_david_j_peery.pdf
    • https://cdn.shopify.com/s/files/1/0430/5348/2138/files/kesoladav.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tizerosotusalasebix.pdf
    • https://cdn.shopify.com/s/files/1/0431/0705/7825/files/tabla_de_derivadas_e_integrales.pdf
    • https://cdn.shopify.com/s/files/1/0435/3923/4967/files/87951277003.pdf
    • https://cdn.shopify.com/s/files/1/0431/7455/9893/files/fulaturalugetupojiraz.pdf
    • https://cdn.shopify.com/s/files/1/0432/7427/2924/files/gamebogibigenasiweparimov.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 9

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000461f.bin
532dd306999f0c56c9aee3f566c7f191489cd353b2cc979c246acaf3aa7c4ae8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x461F 2972 bytes
font_01_sfnt_off0000509d.bin
4a850a62021488218b3d1143ec41efa4399213773788d69e2062be26ef0b6be5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x509D 5200 bytes
font_02_sfnt_off00006241.bin
791bfe1bb37d901a6caedeb573ca437bd7577f7c309ee0e99c603e334eb4bcbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6241 5068 bytes
font_03_sfnt_off00007318.bin
4299777329fa835b375f935bd200545b74722033dbdd1576c3896d6fa890f2c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7318 5936 bytes
font_04_sfnt_off0000871b.bin
acb44da64110e553c7e683f829329d3bf718fddfbd6d483688d6a98220c9e3c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x871B 5336 bytes
font_05_sfnt_off000099c4.bin
8b1bc5fc1911d740facf492ff50c80907103666560d9d5855d5401cf58725f4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99C4 9424 bytes
font_06_sfnt_off0000ba17.bin
088d7da7a8b4010032148a72d4b67d04751e461e638bb568f92039a87e3d35b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA17 17112 bytes
font_07_sfnt_off0000d1a5.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A5 4324 bytes
font_08_sfnt_off0000df59.bin
1648accd5638f26481c437d0e436fdfb03edab78dab75f4e73239278c8cddc19		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF59 1736 bytes

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