Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f410f31292368c2…

MALICIOUS

PDF

55.8 KB Created: 2020-08-10 09:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19734c4b6f9fd7cbf01337cb0913effa SHA-1: 159faeb72ca23e9719ec3bce859789d2ab63c363 SHA-256: 0f410f31292368c2afa42240f17979ed0c2e1f43b3c3c733395c25e05c01c74a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector service. The document body, though heavily obfuscated, contains a URL that leads to a malicious redirector. This suggests the file is part of a link farm or SEO poisoning campaign designed to 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.ru/pify?keyword=ejercicios+numeros+romanos+6o+primaria+pdf
    • http://nalozo.teegravy.store/uploads/1/3/0/8/130814328/623a5e.pdf
    • http://wumaluga.coconutrevolution101.com/uploads/1/3/1/1/131164250/3badd1f73c.pdf
    • http://files.ellenitesfayephotography.com/uploads/1/3/1/1/131164520/3ac7b81923c6843.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/9342/5316/files/guxiximekidiniz.pdf
    • https://cdn.shopify.com/s/files/1/0433/1415/1589/files/40723631265.pdf
    • https://cdn.shopify.com/s/files/1/0439/4188/8155/files/titumupu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2425/2055/files/28163005585.pdf
    • https://cdn.shopify.com/s/files/1/0433/6130/4728/files/bofaduwuxiradi.pdf
    • https://cdn.shopify.com/s/files/1/0434/7517/3528/files/13543506627.pdf
    • https://cdn.shopify.com/s/files/1/0437/0631/9001/files/68959591537.pdf
    • https://cdn.shopify.com/s/files/1/0432/1129/2829/files/rumeripifitebo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8353/8333/files/98933670441.pdf
    • https://cdn.shopify.com/s/files/1/0431/7347/8560/files/6185897966.pdf
    • https://cdn.shopify.com/s/files/1/0428/3521/4503/files/zixozapiluzokixogokipabin.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b70.bin
d2d8ec2a6ddb2966b5748a50e4d2bc9f789ed16d0ea30ba324846277c4d64e5a
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B70 5456 bytes
font_01_sfnt_off00008dea.bin
6cfba0e47ea30b7c4ae9843d0a253423666646408070517bdd7c19aa930f9892
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DEA 14600 bytes
font_02_sfnt_off0000bad0.bin
7f64a184185b19c4509fb58d2bd1b04ad0bf592a661abde0780cedf99fd3e42e
pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD0 16164 bytes