Malicious PDF — malware analysis report

Static analysis result for SHA-256 71d2588af878b3c4…

MALICIOUS

PDF

41.1 KB Created: 2020-08-19 13:30:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a108e3d78fa8ce9e42d9c0de065d1165 SHA-1: 00b1f8ab5887e31d9f6701e86609a62683e68fd6 SHA-256: 71d2588af878b3c45d08e16d1f8b08702848c07b033cdb3fa26ce422900e3f0e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector URL. The document body, though heavily obfuscated, appears to contain the redirector URL, suggesting an attempt to direct users to malicious infrastructure. The presence of a large number of external PDF links further supports a link-farming or redirection-based attack pattern.

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=alien+skin+bokeh+2
    • http://files.ohioadolescenthealth.org/uploads/1/3/2/7/132740905/856f4f516e034ea.pdf
    • http://files.belleandbeaucompany.com/uploads/1/3/1/4/131438541/2048877.pdf
    • http://kigalep.jacquelyncarterdesigns.com/uploads/1/3/1/6/131637136/kivorogo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0436/1791/0941/files/24389179571.pdf
    • https://cdn.shopify.com/s/files/1/0435/2340/8032/files/zijizefiribub.pdf
    • https://cdn.shopify.com/s/files/1/0434/9178/6918/files/nawata.pdf
    • https://cdn.shopify.com/s/files/1/0430/7963/1001/files/sidejewu.pdf
    • https://cdn.shopify.com/s/files/1/0431/6643/3435/files/35361451082.pdf
    • https://cdn.shopify.com/s/files/1/0432/1152/2209/files/fasuvulerugeranisawexe.pdf
    • https://cdn.shopify.com/s/files/1/0436/0686/8126/files/antropocentrismo_filosofia.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/76957488457.pdf
    • https://cdn.shopify.com/s/files/1/0432/2036/9576/files/alphago_paper_nature.pdf
    • https://cdn.shopify.com/s/files/1/0435/7881/8715/files/convert_to_svg_online.pdf
    • https://cdn.shopify.com/s/files/1/0431/4837/8280/files/japefidiluwugomajab.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_off00005749.bin
a51c78dfa14609120997abb4742f63f2f319a8eed0a7bba782734d8a80a905b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x5749 4500 bytes
font_01_sfnt_off00006678.bin
c2de8a47a19e43233aa5d5b07a74346eaf17a9f3d3685ca19142a1fa469caa5b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6678 10248 bytes
font_02_sfnt_off000089a7.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x89A7 4324 bytes