Malicious PDF — malware analysis report

Static analysis result for SHA-256 06a705191990dae7…

MALICIOUS

PDF

40.8 KB Created: 2020-08-11 19:50:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a1fa7b2aa504c6855321b8390cfe640e SHA-1: 263fd78a02c4b7f0c3cb7febaeba38212ee2b79c SHA-256: 06a705191990dae764a2a987bdeddb2fa7d1cd9bb7253ecc1ba19a9edf54d644
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure related to 'classroom assessment for student learning'. The presence of a malicious redirector and a link farm suggests an attempt to drive traffic to malicious infrastructure, likely for phishing or malware distribution.

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/pify?keyword=classroom+assessment+for+student+learning+stiggins+pdf
    • http://sizafe.twocentcomics.com/uploads/1/3/1/1/131163635/bixumogafexulun_xasaxijibugev.pdf
    • http://files.braznstudio.com/uploads/1/3/1/0/131070011/xudoxitaxevenuz_tifute.pdf
    • http://files.soireepa.com/uploads/1/3/0/7/130775808/3d7e2cd9098578.pdf
    • http://jiposip.jerestormer.com/uploads/1/3/1/4/131453494/fipagilunid.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0435/1574/0314/files/38812743735.pdf
    • https://cdn.shopify.com/s/files/1/0440/6562/0118/files/32635830517.pdf
    • https://cdn.shopify.com/s/files/1/0440/5103/8358/files/56561228858.pdf
    • https://cdn.shopify.com/s/files/1/0437/9492/3677/files/20162329093.pdf
    • https://cdn.shopify.com/s/files/1/0433/8273/5006/files/balanced_diet_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/9353/9482/files/jotajedutavamone.pdf
    • https://cdn.shopify.com/s/files/1/0438/5341/4565/files/bootstrap_4_components.pdf
    • https://cdn.shopify.com/s/files/1/0427/8488/2844/files/barzanji_marhaban.pdf
    • https://cdn.shopify.com/s/files/1/0429/0464/9884/files/25387738612.pdf
    • https://cdn.shopify.com/s/files/1/0428/0900/0103/files/marovenodoropuwenoren.pdf
    • https://cdn.shopify.com/s/files/1/0437/4138/0759/files/analytical_writing_examples.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_off000053b0.bin
0f621233faf13b62883a32ef9b7a65d2e2362592bdf3d75de65aea152ec6ca87		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53B0 5268 bytes
font_01_sfnt_off0000657e.bin
d41ffc173da5ed3408b3cec1853c5b397eca6219aea4f8e59a2c4cddad814167		 pdf-font-stream PDF embedded font (sfnt) at offset 0x657E 10060 bytes
font_02_sfnt_off000087e2.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x87E2 4324 bytes

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