Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a26fa880a8557c9…

MALICIOUS

PDF

53.0 KB Created: 2020-08-06 20:39:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 87ea5b86d99ff51dd6cec15df9fc7b5c SHA-1: d05c9b136ec95e8776d929dd7ea8f026f7f46ceb SHA-256: 7a26fa880a8557c99e21fc1c6613e5836204e66e7be8a546caf2e2fc629c1a18
154 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, many of which point to external PDF files hosted on Shopify. One of the primary links, https://ttraff.ru/wb?keyword=indicadores%20economicos%20ecuador%20pdf, is identified as a malicious redirector. The document's structure and link farm suggest an attempt at SEO poisoning or traffic manipulation, rather than delivering a direct payload. No scripts were extracted, but the presence of malicious redirectors and a link farm indicates a high likelihood of malicious intent.

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/wb?keyword=indicadores%20economicos%20ecuador%20pdf
    • http://files.forgeriesblacksmithing.com/uploads/1/3/1/4/131406430/6135460.pdf
    • http://files.prigitalsolutions.com/uploads/1/3/1/0/131071076/577897.pdf
    • http://files.breakthroughhealthclinic.com/uploads/1/3/1/4/131406352/8716276.pdf
    • http://files.oterolincolnsane.org/uploads/1/3/1/8/131856331/f8ab343ab6e72.pdf
    • http://files.newyorkfashionacademy.com/uploads/1/3/2/6/132681946/5250426.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/1570/7551/files/51616938611.pdf
    • https://cdn.shopify.com/s/files/1/0437/4393/6673/files/62446672772.pdf
    • https://cdn.shopify.com/s/files/1/0429/3555/0119/files/jozovibesu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7652/5984/files/suxepikopobupewuvafale.pdf
    • https://cdn.shopify.com/s/files/1/0430/1357/0709/files/zuxedorujixuwufekuk.pdf
    • https://cdn.shopify.com/s/files/1/0433/7405/1491/files/the_prince.pdf
    • https://cdn.shopify.com/s/files/1/0431/7347/8560/files/tinujiwosadolepinateko.pdf
    • https://cdn.shopify.com/s/files/1/0432/1745/3211/files/lapifidar.pdf
    • https://cdn.shopify.com/s/files/1/0431/9815/2866/files/calculus_2.pdf
    • https://cdn.shopify.com/s/files/1/0437/9679/1456/files/rowujekigemebutavawon.pdf
    • https://cdn.shopify.com/s/files/1/0437/6041/8970/files/zezujidenome.pdf
    • https://cdn.shopify.com/s/files/1/0432/2341/6987/files/44892260867.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/rotefes.pdf
    • https://cdn.shopify.com/s/files/1/0431/2399/8874/files/rafinisamo.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_off00008221.bin
e125332d0cbe20ad516776197b62c313574fc6bc51a520674659969f3453e4e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8221 5208 bytes
font_01_sfnt_off000093c0.bin
37311db964d9f7cf118a25af1cd0139f95a8873ab785b80df227bccb1ad5ea8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93C0 16468 bytes

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