Malicious PDF — malware analysis report

Static analysis result for SHA-256 711f9b6a400a43d4…

MALICIOUS

PDF

45.5 KB Created: 2020-08-12 04:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ab291ea2a2a86c1056fa4a22664dd3ff SHA-1: e607f944c8d2466c8cba6cb455ac39055b3d9423 SHA-256: 711f9b6a400a43d4f78262e57fc4f88b63b693ec30a06db4f5927fdc5f114071
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The presence of a large number of external PDF links suggests a link farm or SEO manipulation tactic, potentially to distribute malicious content or drive traffic to malicious sites.

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=alicia+a+traves+del+espejo+libro+original+pdf
    • http://files.moonsiewshutters.com/uploads/1/3/1/4/131453712/1976e97259ca4.pdf
    • http://files.wlfoundation.net/uploads/1/3/0/9/130969974/limazed-mojevo-sinomajajatib-gosigug.pdf
    • http://files.shaysbowtique.com/uploads/1/3/1/8/131872021/dinosok-pazefavuvupuka-runatav.pdf
    • http://nimipoxe.elitecresties.com/uploads/1/3/0/9/130969772/75273a2b032810.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/0596/8537/files/sinukogiv.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/29331550606.pdf
    • https://cdn.shopify.com/s/files/1/0430/3912/9751/files/human_skeletal_anatomy.pdf
    • https://cdn.shopify.com/s/files/1/0435/7901/5327/files/25404904114.pdf
    • https://cdn.shopify.com/s/files/1/0434/6337/7048/files/58629228260.pdf
    • https://cdn.shopify.com/s/files/1/0431/1570/8573/files/pepukuxevoxipinibixeser.pdf
    • https://cdn.shopify.com/s/files/1/0450/0937/1286/files/cecil_internal_medicine_25th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/0643/5232/files/26859075116.pdf
    • https://cdn.shopify.com/s/files/1/0435/7577/1304/files/cambridge_english_first_for_schools_practice_tests.pdf
    • https://cdn.shopify.com/s/files/1/0427/8868/3932/files/62998104306.pdf
    • https://cdn.shopify.com/s/files/1/0428/7925/4694/files/4858590999.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_off00006fa7.bin
b33b7db19d4274f68bacd839b2b286dd479db7d6231fa9900e119fc452fb7210		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA7 5588 bytes
font_01_sfnt_off000082ba.bin
585c4245c6ebf9ca0e7d4e12fe689908229407a570b60f436001530a9c2bb4e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x82BA 11316 bytes

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