Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a86499a3b611ab7…

MALICIOUS

PDF

50.3 KB Created: 2020-08-10 07:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c6f16449b0fc6147aa344b48b5e886aa SHA-1: 90be75d8ed1d14fc0e3a30610b2af5b7cfa459fd SHA-256: 7a86499a3b611ab779138ce2ee1be6563eeeebdacf061480f8a520c2f5d643b4
154 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, with one identified as a malicious redirector. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of numerous links and the malicious redirector points to a likely distribution or SEO manipulation tactic.

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=meses+hebreos+pdf
    • http://files.bepresentpdx.com/uploads/1/3/2/6/132681698/nevapaperabiso.pdf
    • http://fimega.foodandmoodcounseling.net/uploads/1/3/1/3/131383791/678595.pdf
    • http://files.awakenyoursoulyoga.com/uploads/1/3/2/6/132695336/wutinolan_gibumuvujin_fibepak_genuxoresuf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/4071/7462/files/90146182412.pdf
    • https://cdn.shopify.com/s/files/1/0428/6388/6495/files/ditoxajesu.pdf
    • https://cdn.shopify.com/s/files/1/0432/4599/4146/files/vulovafipuv.pdf
    • https://cdn.shopify.com/s/files/1/0437/7539/3944/files/camadas_da_atmosfera_terrestre.pdf
    • https://cdn.shopify.com/s/files/1/0434/7458/3709/files/libro_el_cerebro_femenino_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0430/6190/3517/files/34579099254.pdf
    • https://cdn.shopify.com/s/files/1/0433/5045/8526/files/dunuzoviduvubuloduzetujez.pdf
    • https://cdn.shopify.com/s/files/1/0428/4396/3548/files/35011834133.pdf
    • https://cdn.shopify.com/s/files/1/0437/4550/9537/files/milonijuwawebebek.pdf
    • https://cdn.shopify.com/s/files/1/0435/0109/3030/files/bebofopaxo.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_off000085e8.bin
3196fad8e85d02dba44601e089bd3f4a63bd995a196e896ba993971e0290715c
pdf-font-stream PDF embedded font (sfnt) at offset 0x85E8 5032 bytes
font_01_sfnt_off00009704.bin
ce3b07ff46b1c4c6c3d6aefc7de3276177c4972b95f262475c2afbfd2744e0f6
pdf-font-stream PDF embedded font (sfnt) at offset 0x9704 11212 bytes