Malicious PDF — malware analysis report

Static analysis result for SHA-256 680c12f2958c60d4…

MALICIOUS

PDF

38.5 KB Created: 2020-08-25 22:12:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 12337394819e4d343af5bbd55c55f7b1 SHA-1: 7be626708fd4f9e0d972f65edc0080118c81e876 SHA-256: 680c12f2958c60d44139f18b27e7a0995ebe6403fb1160a767cc809cc52394f7
154 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector, suggesting a link farm or phishing attempt. The document body, while heavily obfuscated, contains the same lure text as the malicious URL, indicating an attempt to trick users into clicking the link. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence score support a 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.ru/pify?keyword=al+kitaab+part+2+answer+key+3rd+edit
    • http://jibivos.carpetcleaningstpete.com/uploads/1/3/0/7/130738948/zikuvunowimabafasor.pdf
    • http://files.freestylecandles.com/uploads/1/3/0/8/130814594/widapanumesag.pdf
    • http://wupofi.ladavisbooksllc.com/uploads/1/3/0/8/130813509/81c40874b.pdf
    • http://files.paulharringtonpoetrysite.com/uploads/1/3/0/7/130775760/xuludefoji-gedasomotokomut-kikagewewabiz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/31452214676.pdf
    • https://cdn.shopify.com/s/files/1/0437/7794/9848/files/zaxexitibegobajaxenuzur.pdf
    • https://cdn.shopify.com/s/files/1/0435/2029/5064/files/56871600156.pdf
    • https://cdn.shopify.com/s/files/1/0431/0515/7269/files/zakojofesonigolelaxoroxa.pdf
    • https://cdn.shopify.com/s/files/1/0430/6049/4490/files/abecedario_en_ingles_con_imagen.pdf
    • https://cdn.shopify.com/s/files/1/0433/4852/5208/files/angular_formarray_setvalue_example.pdf
    • https://cdn.shopify.com/s/files/1/0430/1121/1425/files/gdpr_compliant_privacy_policy_template_small_business.pdf
    • https://cdn.shopify.com/s/files/1/0432/2459/6642/files/jumet.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_off00004b51.bin
0cff73d8c40d45e50a63721290011c7c0bfa87fa2715b8e87a58976dd101a2d6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B51 5312 bytes
font_01_sfnt_off00005d6a.bin
652fec4f18461c2f681bd5f2e0816890cb5b4a67b5e5c6af93bae851a8aaa7cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D6A 9900 bytes
font_02_sfnt_off00007f54.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7F54 4324 bytes

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