Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f50d7fea623536…

MALICIOUS

PDF

45.7 KB Created: 2020-10-17 06:38:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 59de9b94d29f4d2b1f01d677567467e2 SHA-1: 7103f0c491a4e2bd5ed2e74e4a873be2d1e0d928 SHA-256: 55f50d7fea6235363b63e5e9cfe49e768bd568a25b5b6646ad41e58286100b41
154 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to Shopify and Weebly domains, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure at `https://ttraff.me/123?keyword=spanish+2+worksheet+present+progressive+tense+answers`. The document body, though heavily obfuscated, contains references to a Spanish worksheet and the URL, indicating a lure to a malicious site. The presence of embedded URLs and the ML classifier's high confidence further support the malicious classification.

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.me/123?keyword=spanish+2+worksheet+present+progressive+tense+answers In PDF document text
    • https://vozunutav.weebly.com/uploads/1/3/0/9/130969695/nibiwer.pdfIn PDF document text
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/nowuribinajefojavot.pdfIn PDF document text
    • https://migirebunimalab.weebly.com/uploads/1/3/1/3/131383914/gujaxerovezewike.pdfIn PDF document text
    • https://kurikezexiwu.weebly.com/uploads/1/3/0/7/130775092/0f11c61ea3fc870.pdfIn PDF document text
    • https://dokodajibebabek.weebly.com/uploads/1/3/2/3/132302773/5199705.pdfIn PDF document text
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/c13a2c1.pdfIn PDF document text
    • https://fidurelofomus.weebly.com/uploads/1/3/0/7/130740547/f88ce4488bae2.pdfIn PDF document text
    • https://wedebiki.weebly.com/uploads/1/3/0/9/130969436/wadubalevakawalako.pdfIn PDF document text
    • https://xawuwotogot.weebly.com/uploads/1/3/2/6/132695388/goxonarimuvi_vowunepe_lutofuzadugike.pdfIn PDF document text
    • https://towetebofipu.weebly.com/uploads/1/3/1/4/131437669/rosuxoluvevi.pdfIn PDF document text
    • https://biwugina.weebly.com/uploads/1/3/1/1/131163984/jufupiwesikumi_lomemijepatok.pdfIn PDF document text
    • https://zosupexaduj.weebly.com/uploads/1/3/0/7/130738593/vorifakorebudi.pdfIn PDF document text
    • https://sukowaletudevux.weebly.com/uploads/1/3/0/8/130874669/36ac87e6dc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0498/1007/9898/files/87814237735.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/4809/9736/files/ap_human_geography_chapter_5_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0499/7952/3240/files/74709528529.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0498/0306/7556/files/bosch_gts1031_fence_upgrade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9499/0247/files/wofepaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2936/4899/files/81154247450.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6779 5288 bytes
SHA-256: 377ae16e98ebc54848187f368f969270499b0104de5c5d6fc315bb7791068240
font_01_sfnt_off0000797c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x797C 9816 bytes
SHA-256: 28864b8ddc71f16092a215d4170eb8bd84eba7cfb00a1187349e7356761d8b5b
font_02_sfnt_off00009b0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B0E 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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