Malicious PDF — malware analysis report

Static analysis result for SHA-256 07bb167d6f734c4f…

MALICIOUS

PDF

42.8 KB Created: 2020-08-09 14:11:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8044e69cc67d0d6f9f4e9a6ebfe1b11d SHA-1: 3fbe1a4d205b292b7b2ec0388ff1f4949bc6ab6d SHA-256: 07bb167d6f734c4fcf6f6526a82ce97ea7efde9ffc925da4d2965cafc27f7e7f
162 Risk Score

Malware Insights

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

The PDF contains a link disguised as a dictionary download that redirects to a malicious URL, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous external PDF links suggests a link farm intended to manipulate search engine results or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=cambridge+advanced+learner+s+dictionary+pdf+download
    • http://files.chardonnayhoa.com/uploads/1/3/0/7/130775866/d293c8274ea.pdf
    • http://files.thetlacademy.shop/uploads/1/3/1/3/131384789/dupive-madelubupazape-dezarekinoza.pdf
    • http://files.thanksforeverything.shop/uploads/1/3/0/9/130968950/zemof-ribip-tofividek-mipuvejoguta.pdf
    • http://files.winnebagoarchersinc.com/uploads/1/3/1/4/131407705/3390232.pdf
    • http://files.livelifewelltherapy.com/uploads/1/3/0/8/130874433/8199104.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/0781/1482/files/23301481323.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/xutuxajaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/52665001447.pdf
    • https://cdn.shopify.com/s/files/1/0434/7245/3797/files/nonverbal_communication_activities.pdf
    • https://cdn.shopify.com/s/files/1/0436/7617/2441/files/beckman_coulter_access_2_test_menu.pdf
    • https://cdn.shopify.com/s/files/1/0451/3621/6229/files/how_do_i_get_github_io.pdf
    • https://cdn.shopify.com/s/files/1/0432/3406/6600/files/action_research_theory.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/larupo.pdf
    • https://cdn.shopify.com/s/files/1/0440/0729/3086/files/wedukob.pdf
    • https://cdn.shopify.com/s/files/1/0428/6713/0534/files/resaneseloniti.pdf
    • https://cdn.shopify.com/s/files/1/0434/5289/1298/files/31444442237.pdf
    • https://cdn.shopify.com/s/files/1/0437/3469/6097/files/sapabava.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_off000064a5.bin
20b07905dabfed526c54db1d9244170a588eccc6d86ed805df266f117f19cf1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64A5 5772 bytes
font_01_sfnt_off0000784b.bin
c0cf1e3428436e17029a24f343249ddf7f1c1abe3a2b6d42b4e7cfb9e1adcfb9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x784B 10988 bytes

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