Malicious PDF — malware analysis report

Static analysis result for SHA-256 6628e176f5aff523…

MALICIOUS

PDF

57.5 KB Created: 2020-08-19 11:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7631509d7819f1808e928b573ce2a97d SHA-1: d6fb84e6f7856472b05fc6c0821420f0c2bbb470 SHA-256: 6628e176f5aff52391c4397c568e33ed13052b85755df6d4d4f86f3d3a622d6e
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link and a large number of external PDF links, suggesting a link farm or distribution mechanism. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the embedded URLs and the PDF structure point towards an attempt to redirect users to potentially harmful content or to manipulate search engine results.

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=bhalu+ka+game+ing
    • http://vikewa.dalymanningopticians.com/uploads/1/3/2/7/132740954/xegojidek_wedepumibu.pdf
    • http://dixuz.grasart.com/uploads/1/3/2/6/132681556/201615.pdf
    • http://files.patrickx.net/uploads/1/3/1/6/131637218/susiduvaleta-lodunapodoxa-notum.pdf
    • http://files.lindabutlerphoto.com/uploads/1/3/1/4/131406621/xekopemazavivukazil.pdf
    • http://files.personalhibachichef.com/uploads/1/3/1/3/131380591/fopopodazodaze.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://cdn.shopify.com/s/files/1/0433/9105/8083/files/4894327344.pdf
    • https://cdn.shopify.com/s/files/1/0436/0221/5069/files/1585368481.pdf
    • https://cdn.shopify.com/s/files/1/0431/6866/1670/files/faguzorebirufara.pdf
    • https://cdn.shopify.com/s/files/1/0434/7035/6632/files/tugomasuvaderatulafinuwa.pdf
    • https://cdn.shopify.com/s/files/1/0428/5677/5839/files/tawirobedufuxopafevalon.pdf
    • https://cdn.shopify.com/s/files/1/0434/4964/7271/files/29315538395.pdf
    • https://cdn.shopify.com/s/files/1/0433/2368/7067/files/77115704298.pdf
    • https://cdn.shopify.com/s/files/1/0435/8343/9003/files/govoralekazagixat.pdf
    • https://cdn.shopify.com/s/files/1/0440/7489/3477/files/kojab.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/zirajuluwudegavugoder.pdf
    • https://cdn.shopify.com/s/files/1/0433/3545/0774/files/81092912664.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006e7d.bin
25c0bba19f432c36329fcb92034f94dd10b488a4dce69aacc8c0eb5d101bf100		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E7D 6384 bytes
font_01_sfnt_off00007e34.bin
6124eb39f3f679d0203aa7a4f6592b21148676278f487a7ba5578b13c36fd7cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E34 4940 bytes
font_02_sfnt_off00008edb.bin
1cf92465fee85251f4a6190cae0c8d80404579042799ed05d0cb87c1995d5c46		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8EDB 3708 bytes
font_03_sfnt_off00009d74.bin
453ebb95ebbef3bd136e894197b5da34fe5756a49a289521d1dd4bb042b6970f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D74 10436 bytes
font_04_sfnt_off0000c14f.bin
6152378feb341f673791f6773405d004d142f1e9da674925fc1ce085708933e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC14F 6560 bytes

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