Malicious PDF — malware analysis report

Static analysis result for SHA-256 82d920259a739eb5…

MALICIOUS

PDF

40.1 KB Created: 2020-08-22 10:15:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8186b80f89eaef050a726fd345144881 SHA-1: 6ab686407a72b0b2b29cc5b145fe4da1ac623549 SHA-256: 82d920259a739eb5df1c5608822eeda5d13dda830916f37b22488b90b8b018b7
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a lure related to 'whatsapp stickers android apk free' and embeds numerous links, including one pointing to known malicious redirector infrastructure. The ML classifier and specific heuristics strongly indicate malicious intent, likely to redirect users to a malicious site or download further malware. The document body, though heavily obfuscated, contains the primary malicious URL and other PDF links, suggesting a link farm or redirection attack.

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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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=whatsapp+stickers+android+apk+free
    • http://petitaz.khsphotographers.com/uploads/1/3/1/1/131164250/zekelixo.pdf
    • http://files.merakihandmades.com/uploads/1/3/1/4/131483386/888352.pdf
    • http://files.melbournesupercarspotters.com/uploads/1/3/0/7/130739631/5049296.pdf
    • http://files.happywayhealing.com/uploads/1/3/0/7/130775838/sijepo_velekizofuroja.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1898/5372/files/pisorotuwe.pdf
    • https://cdn.shopify.com/s/files/1/0441/0294/2872/files/fundamentals_of_chinese_characters.pdf
    • https://cdn.shopify.com/s/files/1/0434/4699/3063/files/woxaf.pdf
    • https://cdn.shopify.com/s/files/1/0437/0687/6055/files/nokaf.pdf
    • https://cdn.shopify.com/s/files/1/0428/0729/6163/files/setepirulo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1361/1421/files/online_converter_to_jpg_with_high_resolution.pdf
    • https://cdn.shopify.com/s/files/1/0433/9499/0231/files/pupaporalupoxeje.pdf
    • https://cdn.shopify.com/s/files/1/0433/4046/4281/files/xewimedakufixemu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6128/8868/files/votiviritezoketawameleza.pdf
    • https://cdn.shopify.com/s/files/1/0434/8333/2772/files/22899097762.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_off00005f3d.bin
7a41c0d8df6391853e24b4399c261b485024b4243a21668e8ec3b5db136aadcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F3D 5288 bytes
font_01_sfnt_off0000713a.bin
f5523b6b42d18dbd1294ae09d2a7e378f5a75829940738f1655e865acc1e0758		 pdf-font-stream PDF embedded font (sfnt) at offset 0x713A 9996 bytes

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