Malicious PDF — malware analysis report

Static analysis result for SHA-256 19315a31809d944c…

MALICIOUS

PDF

39.5 KB Created: 2020-08-08 13:03:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dbf5bd81669f6ac644e8b4ac48f074a3 SHA-1: 11e802dcc8037e46871d7572b5dac11e26873757 SHA-256: 19315a31809d944c6bd112328c23eefddb03c01910b393dfd61f52f3eba81a03
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains, but one critical link directs to a known malicious redirector. The document body text, though heavily obfuscated, includes the same URL, suggesting an attempt to lure users to malicious content. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent.

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=cash+flow+statement+problems+with+adjustments+pdf
    • http://files.beautifuldefect.com/uploads/1/3/1/1/131163872/ruvuradopadol-pedamaxud.pdf
    • http://files.duannkier.com/uploads/1/3/0/7/130775971/7854723.pdf
    • http://files.innovaxin.com/uploads/1/3/1/4/131453247/velibawuximeruga.pdf
    • http://files.bullengarookadultriders.com/uploads/1/3/2/6/132681596/fomapofegaro-wopigadazodup-zevevamer-tirexilagenizo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/6601/5400/files/76980135056.pdf
    • https://cdn.shopify.com/s/files/1/0428/1873/2191/files/95945221804.pdf
    • https://cdn.shopify.com/s/files/1/0431/7410/1160/files/75962043116.pdf
    • https://cdn.shopify.com/s/files/1/0435/1760/8090/files/comparative_and_superlative_adverbs.pdf
    • https://cdn.shopify.com/s/files/1/0428/2076/3804/files/jekijasodunupiwi.pdf
    • https://cdn.shopify.com/s/files/1/0431/3156/8290/files/39157223718.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bewasovenajuwawofitef.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/93527538138.pdf
    • https://cdn.shopify.com/s/files/1/0437/6231/9517/files/al_quran_hafizi_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0436/0952/2339/files/organic_farming_wrt_cosmic_energy.pdf
    • https://cdn.shopify.com/s/files/1/0428/1440/6823/files/simple_present_exercises_test.pdf
    • https://cdn.shopify.com/s/files/1/0429/2955/3575/files/nibazelitedarifupusa.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_off00005d72.bin
41b54ed2f253b89e5466b85aa4be240a302e3f793d0b5d80ab177d3ca94962c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D72 5492 bytes
font_01_sfnt_off00006ffb.bin
7dd69f6f26ed0c9db6d6f4740c82278f61d890ed0319a4c67330a633cdeaa8a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FFB 9648 bytes

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