Malicious PDF — malware analysis report

Static analysis result for SHA-256 80a0c72894f83e93…

MALICIOUS

PDF

42.4 KB Created: 2020-08-02 21:19:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59e7701b7f740f98dcc90ae7dc5d2779 SHA-1: 43950c65d088ce447e2561823264199976cff122 SHA-256: 80a0c72894f83e93de210530be9fe88fabc4099ea8de6ba7329445fb122eed12
162 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one identified as a malicious redirector. The document body, though partially corrupted, suggests a lure related to a 'Da form 1594 pdf fillable'. The presence of a download button heuristic further supports a malicious workflow. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of it being used for phishing or malware distribution.

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.cc/pify?keyword=da+form+1594+pdf+fillable
    • http://files.vanessaarmandtesol.com/uploads/1/3/2/7/132740291/142095.pdf
    • http://files.bioskosmoschurchgov.org/uploads/1/3/1/4/131437889/nanolid-bekalataxukiwi-nujakowene-wonulupepisif.pdf
    • http://files.hoffnungfuerallechurch.com/uploads/1/3/1/8/131856713/sugigesipi.pdf
    • http://files.okrarestaurantgroup.com/uploads/1/3/1/3/131398242/c09e9d6bf1d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/97589159167.pdf
    • https://cdn.shopify.com/s/files/1/0431/3058/5239/files/vexotazivukitep.pdf
    • https://cdn.shopify.com/s/files/1/0431/4411/8423/files/56732204552.pdf
    • https://cdn.shopify.com/s/files/1/0430/3015/1330/files/17373670849.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/laxigitifudavizemitipa.pdf
    • https://cdn.shopify.com/s/files/1/0432/4586/3067/files/pegajorawubalade.pdf
    • https://cdn.shopify.com/s/files/1/0429/1097/4111/files/kiwufe.pdf
    • https://cdn.shopify.com/s/files/1/0437/5258/7415/files/dexogubopabizabataxuzi.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/80941451808.pdf
    • https://cdn.shopify.com/s/files/1/0433/0032/3478/files/63828121087.pdf
    • https://cdn.shopify.com/s/files/1/0431/9114/0501/files/buvezopukewudofalorivaboj.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00007eb4.bin
aaf77fbcd5d8bde8e415ed0d7ea5635602ad5eae16f0b231ad425aa5d51097f7		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x7EB4 18512 bytes
font_00_sfnt_off00004782.bin
28c071ee39e96249abfd3aeb2116deadda0ae224be6e03c31a883231fb37d753		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4782 5568 bytes
font_01_sfnt_off00005a66.bin
9dedecfbc5e7ce94a5561977ee471f5aebc82d41c01af932a819ccd92b22a8f1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A66 10948 bytes

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