Malicious PDF — malware analysis report

Static analysis result for SHA-256 b481e15b825c8626…

MALICIOUS

PDF

43.8 KB Created: 2020-08-06 00:27:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb9efbdefc7ae2ea539f755f2dad407b SHA-1: 9fb4f029914d93d1aa4d26b6451f20d27b0eebae SHA-256: b481e15b825c8626394537fac1c489dec588dbef13e404557ccd99d292b36ee6
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link that is disguised as a free PDF to Word converter. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms this, and the ML classifier also flagged the document as malicious. The embedded URL in the document body, 'https://ttraff.cc/pify?keyword=how+to+convert+pdf+to+word+document+for+free+online', is the primary indicator of malicious intent, likely leading to a phishing or malware download site.

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.cc/pify?keyword=how+to+convert+pdf+to+word+document+for+free+online
    • http://files.varycarol.com/uploads/1/3/0/7/130775743/719b91eb08b.pdf
    • http://files.tcbmds.org/uploads/1/3/0/8/130814254/pikalijexebaw_podebixugas_tapefakurenuja.pdf
    • http://lakejive.alexisortizart.com/uploads/1/3/1/3/131380485/c76caf7c3.pdf
    • http://files.bonniemeguid.com/uploads/1/3/1/6/131606331/2151419.pdf
    • https://cdn.shopify.com/s/files/1/0431/8802/7543/files/url_to_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0438/4456/7197/files/artificial_intelligence_in_education.pdf
    • https://cdn.shopify.com/s/files/1/0434/7753/2822/files/gozajogijisa.pdf
    • https://cdn.shopify.com/s/files/1/0433/7447/7464/files/zukusinawigedokesat.pdf
    • https://cdn.shopify.com/s/files/1/0432/1692/8923/files/harrisons_internal_medicine.pdf
    • https://cdn.shopify.com/s/files/1/0432/8970/6664/files/zozapuzalogeridizi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2299/1007/files/19759003891.pdf
    • https://cdn.shopify.com/s/files/1/0438/2087/5938/files/export_nano_docker.pdf
    • https://cdn.shopify.com/s/files/1/0437/3410/6277/files/pdf_to_word_converter_nitro_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/8368/5270/files/tivenubawonutisuxejelavi.pdf
    • https://cdn.shopify.com/s/files/1/0432/2282/7165/files/physics_practical_book_for_bsc_1st_year_download.pdf
    • https://cdn.shopify.com/s/files/1/0438/9843/7784/files/74370046039.pdf
    • https://cdn.shopify.com/s/files/1/0436/9252/3675/files/chemistry_in_context_7th_edition_download.pdf
    • https://cdn.shopify.com/s/files/1/0429/1405/4300/files/39208093740.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_off00006def.bin
1089e16d683ab6a02213b10db0887e3e49e1d3a4cba779eb1644a92dd98e87c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DEF 5024 bytes
font_01_sfnt_off00007f0e.bin
89915df339fcb50b1708b0148dcdbfe8760dd25bf3acc8f2147306c904c687c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F0E 10032 bytes

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