Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f837637c26715f4…

MALICIOUS

PDF

42.7 KB Created: 2020-08-29 18:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c125529bd266836707e3b867d806b198 SHA-1: 9f658d23486258160c13d60dc1e56f9e2b52c052 SHA-256: 4f837637c26715f49cb717347deef0bb4471c6e703611cd1f40b1973daf356f2
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a search result for 'planeacion semanal para preescolar pdf'. This link points to 'ttraff.ru', which is flagged as malicious. The document also contains a large number of external PDF links, many hosted on Shopify, likely part of an SEO link farm to obscure the malicious redirector. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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/wix?keyword=planeacion+semanal+para+preescolar+pdf
    • https://cdn.shopify.com/s/files/1/0441/0372/9304/files/dasom.pdf
    • https://cdn.shopify.com/s/files/1/0434/8398/8125/files/le_bouddhisme_gratuit.pdf
    • https://cdn.shopify.com/s/files/1/0428/2282/8198/files/53823264699.pdf
    • https://cdn.shopify.com/s/files/1/0437/1415/0553/files/basics_of_anesthesia_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/8783/9910/files/hill_dwarf_cleric.pdf
    • https://cdn.shopify.com/s/files/1/0432/5644/7136/files/firewall_configuration_in_network_security.pdf
    • https://cdn.shopify.com/s/files/1/0431/6794/0765/files/vocabulary_words_with_tamil_meaning_and_sentence_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0462/7169/2951/files/pukafomutajowu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3430/3912/files/a_soup_can_is_in_the_shape_of_a_cylinder.pdf
    • https://cdn.shopify.com/s/files/1/0428/5045/1623/files/tokutadikotulusuburoja.pdf
    • https://cdn.shopify.com/s/files/1/0427/4978/8327/files/disgrace_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/larilu.pdf
    • https://cdn.shopify.com/s/files/1/0430/4722/3458/files/denedawijamewuvuxeb.pdf
    • https://cdn.shopify.com/s/files/1/0431/2537/5130/files/hosts_file_download.pdf
    • https://cdn.shopify.com/s/files/1/0437/5530/7159/files/convert_to_word_doc_mac.pdf
    • https://cdn.shopify.com/s/files/1/0431/6377/9221/files/tazawixotol.pdf
    • https://cdn.shopify.com/s/files/1/0435/8576/5533/files/letter_for_employment_as_a_teacher.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006521.bin
fe62c7e92d562409f3982a84ded32457293e53a944939c028aadee1ac12680a4
pdf-font-stream PDF embedded font (sfnt) at offset 0x6521 5300 bytes
font_01_sfnt_off00007705.bin
bcda621106c9ae220fc3fbdb3acde446834f748c6df9dccf1f7c1c876c697d9a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7705 11580 bytes