Malicious PDF — malware analysis report

Static analysis result for SHA-256 689da1b595464fdc…

MALICIOUS

PDF

38.9 KB Created: 2020-09-12 05:31:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7084078c28c7c3b132ef52246e10f685 SHA-1: 9aebe22900aac055fe3bf67343bb2f2faee082f0 SHA-256: 689da1b595464fdc8f25407cf06070493b076c1a34deef24a6f99d1b1135ae78
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to a 'Bitzer csh compressor manual' and the malicious URL, suggesting a lure to a phishing or malware distribution site. The presence of many external PDF links also indicates a link farm strategy, likely for SEO poisoning or to obscure the final malicious destination.

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.club/wix?keyword=bitzer+csh+compressor+manual
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0440/9327/6312/files/60982191595.pdf
    • https://cdn.shopify.com/s/files/1/0435/1488/8360/files/gujarati_calendar_2019_apk.pdf
    • https://cdn.shopify.com/s/files/1/0433/6877/5841/files/browser_pc_paling_ringan.pdf
    • https://cdn.shopify.com/s/files/1/0432/9222/9797/files/canti_scout_accordi.pdf
    • https://static.usrfiles.com/ugd/275374_aea7717db0e44821b92c20ef1ac50b12.pdf
    • https://static.usrfiles.com/ugd/856cea_e2d88c4c54044811a33d4a43cb4709be.pdf
    • https://static.usrfiles.com/ugd/c268f7_18780f90fa6d40d99fb4c3217fc92056.pdf
    • https://static.usrfiles.com/ugd/1a89c8_35ca5bdcbd18435c959246170d529ed5.pdf
    • https://static.usrfiles.com/ugd/b8c837_d60093e7798a448c8da43e3c348c9671.pdf
    • https://cdn.shopify.com/s/files/1/0434/8103/9013/files/36441708849.pdf
    • https://cdn.shopify.com/s/files/1/0432/0781/9422/files/61026456695.pdf
    • https://static.usrfiles.com/ugd/784815_d53a01764ac24d6cbd5ba40deaf0a8db.pdf
    • https://static.usrfiles.com/ugd/8d0191_237a344679874c1aa6576633896194f9.pdf
    • https://static.usrfiles.com/ugd/eaf48f_be5a1509bc2f42abb3bc1f95f3a23d92.pdf
    • https://static.usrfiles.com/ugd/0010c8_eee7e94f84074ab7910e94967ef06bec.pdf
    • https://static.usrfiles.com/ugd/86319b_8c265c95b49c43ddabb1c964b775f81a.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_off00005b62.bin
1babddc420c0d2db8af9eacbb330c3c1feeb0ab997be493f084ec3a653ac1728		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B62 5272 bytes
font_01_sfnt_off00006d2c.bin
af5881d4bde302fd41948cdac28043100159104da038e03e81917a8ea056c33d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D2C 9852 bytes

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