Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cfd37c047d617fc…

MALICIOUS

PDF

44.4 KB Created: 2020-08-20 07:46:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e39da2e355270a9470007ff774b2350 SHA-1: 55897665d072bd8601ffdf0f2897aaab6ea7a50f SHA-256: 7cfd37c047d617fca189b463498439e1c9e621b65f32372b60ac41b6544cad57
154 Risk Score

Malware Insights

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

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 appears to be the primary lure. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL supports this assessment.

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=vdo+online+form+sarkari+result+2019
    • http://files.lbdsoccer.com/uploads/1/3/2/7/132740214/jotuzizomuri.pdf
    • http://zowejo.nmfwa.org/uploads/1/3/2/7/132712207/4871883.pdf
    • http://files.saintalphonsusschool.org/uploads/1/3/1/8/131857071/b41fba5.pdf
    • http://fajolikup.elisabethpope.com/uploads/1/3/1/4/131453453/4623921.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0431/0230/6468/files/the_astronaut_s_wife_movie.pdf
    • https://cdn.shopify.com/s/files/1/0431/4306/9858/files/fikerixojukupegiwigefeki.pdf
    • https://cdn.shopify.com/s/files/1/0434/2172/8930/files/cambridge_primary_curriculum.pdf
    • https://cdn.shopify.com/s/files/1/0439/3464/6440/files/42081513914.pdf
    • https://cdn.shopify.com/s/files/1/0432/1892/7778/files/54436411741.pdf
    • https://cdn.shopify.com/s/files/1/0435/4048/0164/files/english_grammar_articles_examples.pdf
    • https://cdn.shopify.com/s/files/1/0434/0714/7166/files/rivukejufokazutimote.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7182/files/bitegidetekerituge.pdf
    • https://cdn.shopify.com/s/files/1/0440/6149/1365/files/mogajugawi.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_off00005b66.bin
21cce49e073bee5c3fe9af34c559a6fa68aa6e18355175a7324e97b69207d83f
pdf-font-stream PDF embedded font (sfnt) at offset 0x5B66 5564 bytes
font_01_sfnt_off00006e43.bin
7b4586622efc277e056b70159cde5781728fea702303179f19d5d20b09566739
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E43 9872 bytes
font_02_sfnt_off0000905b.bin
8c9fa717726c590c26fd65e0b1b03d7fe92cefc809f9540efe9e40f7dd8a13c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x905B 5160 bytes