Malicious PDF — malware analysis report

Static analysis result for SHA-256 022aa38a07adfa9d…

MALICIOUS

PDF

39.6 KB Created: 2020-08-31 01:56:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: faef1f0fd94d15ef2ac00cffe143c51d SHA-1: 64124051ad7475a78c4e09c6ada51c798302daab SHA-256: 022aa38a07adfa9d48ae86e529b19478a8da5730d251ca8b0e07dc18d6418651
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/wix?keyword=phantom+of+the+opera+piano+duet+shee'. Additionally, it exhibits characteristics of a PDF link farm, with numerous external links, many of which are benign but serve to obscure the malicious one. The ML classifier also strongly indicated maliciousness. The document body contains garbled text but includes the malicious URL and several benign PDF links.

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/wix?keyword=phantom+of+the+opera+piano+duet+shee
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/01e791_c8a05aa961764270ae46da878a95b3e7.pdf
    • https://static.usrfiles.com/ugd/cafc24_0f56f1e8fcfe41a3807376ecffac52d8.pdf
    • https://static.usrfiles.com/ugd/f0e51d_bb50b656e29c4c4b9a2c14445371ba86.pdf
    • https://static.usrfiles.com/ugd/8b49c6_326cf42a655f4ee28b90c9e1ff307681.pdf
    • https://static.usrfiles.com/ugd/dc51bb_239ebd1690414bf984f0559f51bdb54b.pdf
    • https://cdn.shopify.com/s/files/1/0434/4909/0200/files/sealed_portion_book_of_mormon.pdf
    • https://cdn.shopify.com/s/files/1/0438/0455/7472/files/fowirotezowibudoripokekus.pdf
    • https://cdn.shopify.com/s/files/1/0431/8229/3141/files/aspects_score.pdf
    • https://cdn.shopify.com/s/files/1/0439/7219/8558/files/59859661676.pdf
    • https://cdn.shopify.com/s/files/1/0430/8264/5665/files/98265250440.pdf
    • https://cdn.shopify.com/s/files/1/0430/0469/0581/files/laposovapawexobosadugob.pdf
    • https://cdn.shopify.com/s/files/1/0434/3965/3030/files/93032716210.pdf
    • https://cdn.shopify.com/s/files/1/0431/6332/0469/files/wow_classic_larval_acid.pdf
    • https://cdn.shopify.com/s/files/1/0430/9378/6778/files/graphic_tablet_app_for_android.pdf
    • https://cdn.shopify.com/s/files/1/0437/6104/1559/files/osteoarthritis_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0433/6707/1894/files/lukatoxipeli.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f78.bin
a4f33470f253fc0da718968dc327826992971c4b950cb02b6a23aec8d77cd400		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4F78 5252 bytes
font_01_sfnt_off0000611f.bin
719f08daa7ab2b2584c2bddab88b12ebb14281cd7d7ae18d5dd770be7ca5bfa7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x611F 14788 bytes

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