Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f88f57fa57a1661…

MALICIOUS

PDF

54.1 KB Created: 2020-08-20 23:20:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8de88ee66d7d2b75d9bcd3f9642708e5 SHA-1: bd53bb5419d7a945561521059ab47c5890c841a1 SHA-256: 0f88f57fa57a16615c9c1d0d64718c88ddb33fd1226a17dc5217aac0e29b4495
154 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to what appears to be a link farm designed to host various PDF documents. One prominent link, 'https://ttraff.com/pify?keyword=apertura+inglesa+pdf+gratis', is identified as a malicious redirector. This suggests the document's primary purpose is to direct users to malicious infrastructure, likely for further exploitation or phishing. No scripts were extracted, but the presence of embedded URLs and the malicious redirector strongly indicate a phishing or redirection attack.

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=apertura+inglesa+pdf+gratis
    • http://xogal.loveloveandlove.org/uploads/1/3/0/7/130740049/fepew.pdf
    • http://feteximux.mugahedomar.com/uploads/1/3/0/7/130776433/vupiru_nezedav.pdf
    • http://bikezag.sunshinecoastcelebrant.net/uploads/1/3/2/6/132680981/e88b8f7fc10e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/bosch_cctv_catalog.pdf
    • https://cdn.shopify.com/s/files/1/0430/9473/7045/files/auditing_and_investigation_2.pdf
    • https://cdn.shopify.com/s/files/1/0437/3141/9287/files/23080330489.pdf
    • https://cdn.shopify.com/s/files/1/0432/6211/6008/files/xofiregirojofoz.pdf
    • https://cdn.shopify.com/s/files/1/0431/2258/9853/files/vorasowixugisawa.pdf
    • https://cdn.shopify.com/s/files/1/0428/6591/8118/files/absenteeism_research.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8331/files/gudasobokupuxefadune.pdf
    • https://cdn.shopify.com/s/files/1/0433/3443/4969/files/81403919232.pdf
    • https://cdn.shopify.com/s/files/1/0438/2310/4162/files/diltiazem_hydrochloride_davis.pdf
    • https://cdn.shopify.com/s/files/1/0433/1352/8987/files/action_words_worksheet_for_grade_2.pdf
    • https://cdn.shopify.com/s/files/1/0437/1123/4197/files/madigagizanudejomibam.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007cb3.bin
765fa79b034feee8af11ac35df1948ef02af6348baf1df42d6b3e0c807d5866c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CB3 5200 bytes
font_01_sfnt_off00008e6e.bin
8f1f76f89969257276ecfdbf21e36f221a7b03a6618129c007fcc0dd050c1f69		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E6E 11180 bytes
font_02_sfnt_off0000b328.bin
ea3855bd39a6769c6c780e1d01c2a6e29306a64a2e4f2b6001bca48575995a4c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB328 16932 bytes

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