Malicious PDF — malware analysis report

Static analysis result for SHA-256 99c25fd335c05159…

MALICIOUS

PDF

44.1 KB Created: 2020-08-12 10:45:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f13d5f61fe070d2dbf742c4f37348942 SHA-1: 4de4235c992cfb11b981e172f6e37833494f6e30 SHA-256: 99c25fd335c05159917c88425b6321aeb7422b24035c6fe761550f8ca9a7096d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=descargar+libro+apicultura+pdf'. This URL is presented within the document body, disguised as a book download. The PDF also exhibits characteristics of a link farm, with numerous external links, many of which are to Shopify domains, but the primary malicious intent appears to be the redirector. No scripts were extracted, and the document body is heavily obfuscated, but the presence of the malicious redirector is a strong indicator of a phishing or scam attempt.

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=descargar+libro+apicultura+pdf
    • http://files.lusialatuconsulting.com/uploads/1/3/1/3/131383575/koluwulas.pdf
    • http://zazodo.freshharvestwv.com/uploads/1/3/0/7/130776262/subigiw.pdf
    • http://files.lightenupwithliz.com/uploads/1/3/1/4/131483098/4cc41b189ebf5d.pdf
    • https://cdn.shopify.com/s/files/1/0444/3560/3623/files/diccionario_de_administracion_de_empresas_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0432/2538/3073/files/livejepagojoxipod.pdf
    • https://cdn.shopify.com/s/files/1/0430/8277/6725/files/gipiluso.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vibamiwa.pdf
    • https://cdn.shopify.com/s/files/1/0429/8558/6849/files/47035103232.pdf
    • https://cdn.shopify.com/s/files/1/0434/2834/8056/files/esclerosis_multiple_sintomas_tempranos.pdf
    • https://cdn.shopify.com/s/files/1/0427/6856/4380/files/tamudipalanudonerolenaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/8099/1388/files/64527665339.pdf
    • https://cdn.shopify.com/s/files/1/0430/8851/1130/files/bopojakofijovololawav.pdf
    • https://cdn.shopify.com/s/files/1/0437/9181/0717/files/19760351531.pdf
    • https://cdn.shopify.com/s/files/1/0438/5135/0166/files/93823750858.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/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b41.bin
a95c95128e07c0fa889e735d24dd597359505ef383f3f54fd3e71c6b3b33136e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4B41 5464 bytes
font_01_sfnt_off00005dd3.bin
5254355459bc4e74a465b4fb88f50841f4db3daef55e2fe653cf7dff57631f80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5DD3 2764 bytes
font_02_sfnt_off0000696a.bin
5ca5452d35071c10cba8f7514bede69a621250def932b634cad3371a96451d42		 pdf-font-stream PDF embedded font (sfnt) at offset 0x696A 10580 bytes
font_03_sfnt_off00008c7a.bin
354dce64f07f3d7acdf6a04edf763950ffbfec4edcbb4bfe17b65a83544077bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8C7A 16036 bytes

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