Malicious PDF — malware analysis report

Static analysis result for SHA-256 056826a82a477855…

MALICIOUS

PDF

46.1 KB Created: 2020-08-18 23:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8ee61e26654636168f5822174091b23 SHA-1: eca38e5b6f3174ee0b6bce511ba534d2127a7a0e SHA-256: 056826a82a4778551d2a42f565651de26cf0950ff7a7d2235f542bd7193c812a
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a malicious redirector. The document body, though obfuscated, contains text related to 'greensleeves flute music sheet' and the authoring application, suggesting a lure. The presence of numerous external PDF links indicates a link farm, likely intended to drive traffic or distribute further malicious content. No scripts were extracted, but the embedded links are the primary indicators of malicious activity.

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.cc/pify?keyword=greensleeves+flute+music+sheet
    • http://files.jennibrennan.com/uploads/1/3/1/1/131164402/9833689.pdf
    • http://files.uwphisigmarho.com/uploads/1/3/2/7/132740361/zozedadafomozeg_bifakuvugarud.pdf
    • http://files.kiamichcouncil.com/uploads/1/3/1/4/131408209/5039570.pdf
    • http://files.diagmal.eu/uploads/1/3/0/7/130738943/27b9f.pdf
    • http://files.downtowndogs.ca/uploads/1/3/1/0/131070842/puvet.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0430/9850/5369/files/basic_english_words_with_meaning_in_tamil.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/pewugokujugiwiburonanas.pdf
    • https://cdn.shopify.com/s/files/1/0431/7118/4794/files/wutijiwulopedogemonulaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/0236/3045/files/79111194379.pdf
    • https://cdn.shopify.com/s/files/1/0431/3117/5063/files/gedaboxanipetalulurakalof.pdf
    • https://cdn.shopify.com/s/files/1/0431/6895/6565/files/boss_dd3_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/2660/4447/files/20490739411.pdf
    • https://cdn.shopify.com/s/files/1/0437/3449/9479/files/addicted_novel_book_1.pdf
    • https://cdn.shopify.com/s/files/1/0435/1747/7019/files/paxibamepakevedalelosiza.pdf
    • https://cdn.shopify.com/s/files/1/0429/7857/4490/files/64248013659.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_off00006c2b.bin
c7ce4574a3f2d414ae049e132939f67d8d54517110a4ed6b5c730b55ebbe495a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C2B 5004 bytes
font_01_sfnt_off00007d0e.bin
6ec81cb2ffe633732dfcc578197a01c9c3733346efdc1148a4847986650208aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D0E 15096 bytes

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