Malicious PDF — malware analysis report

Static analysis result for SHA-256 623fe84b09f26880…

MALICIOUS

PDF

76.1 KB Created: 2020-08-18 17:01:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0264097bfeb8a3a8f7592bdb4d0ea878 SHA-1: 628e6c5d297caf9be7729f4f01247b75e904935f SHA-256: 623fe84b09f268806ecdfcce236ba969e178fc5973b599230af9a3e2d2c7571c
154 Risk Score

Malware Insights

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

The PDF file contains embedded links, with one specifically pointing to a known malicious redirector infrastructure. The ML classifier strongly indicated maliciousness, and the presence of numerous external PDF links suggests a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains the target URL, indicating an attempt to direct the user to malicious content.

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.ru/pify?keyword=ay+ai+sound+worksheets
    • http://files.paulnieman.uk/uploads/1/3/0/7/130776162/mufamimixekamak_gexadikolibogew_basujeba_kurovukirisoz.pdf
    • http://files.xanderclaypool.com/uploads/1/3/1/6/131637362/patinupilumevupakeji.pdf
    • http://files.newenglandgoodlife.com/uploads/1/3/2/7/132741052/3c08e3dfaa1e889.pdf
    • http://bakizug.ewaldseries.com/uploads/1/3/1/4/131410538/jiwupevag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/bavugepojope.pdf
    • https://cdn.shopify.com/s/files/1/0432/3885/0728/files/xifapukamuliminirub.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49186839350.pdf
    • https://cdn.shopify.com/s/files/1/0438/9103/2216/files/fidifijazujegixe.pdf
    • https://cdn.shopify.com/s/files/1/0440/7181/3285/files/80886364735.pdf
    • https://cdn.shopify.com/s/files/1/0433/6641/6534/files/makalah_tentang_amandemen_undang_undang_dasar_1945.pdf
    • https://cdn.shopify.com/s/files/1/0435/5588/1121/files/68403657502.pdf
    • https://cdn.shopify.com/s/files/1/0436/5425/0654/files/25702669556.pdf
    • https://cdn.shopify.com/s/files/1/0438/7949/7896/files/ccna_cyber_ops_free.pdf
    • https://cdn.shopify.com/s/files/1/0429/9587/6003/files/viserimuverexosisidexulu.pdf
    • https://cdn.shopify.com/s/files/1/0432/8692/1382/files/zoperateb.pdf
    • https://cdn.shopify.com/s/files/1/0430/6498/3703/files/bakuzukonakobes.pdf
    • https://cdn.shopify.com/s/files/1/0430/2422/0321/files/dedizitevulazowe.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3a7.bin
3b89a1333aa93e194de12c5c5da229a8f3a969ace6b07a90c5323b9ece6747ec		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A7 2828 bytes
font_01_sfnt_off0000eda2.bin
c156c218028e96f08f9133a42e3ba41f06fb8eeef6b81f245d587e3c58a67ca0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA2 5128 bytes
font_02_sfnt_off0000ff1f.bin
ea6b872cfcb09c7168c34174728e467268d1897fe340115bb64ddafd2ba22666		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1F 9932 bytes

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