Malicious PDF — malware analysis report

Static analysis result for SHA-256 6876f9485a399575…

MALICIOUS

PDF

99.9 KB Created: 2020-08-20 11:56:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a2f5af647ee4138340fbb5c7d0ec0a53 SHA-1: d76e7ab440d1404fc0c42b486d7f238dd9be24c4 SHA-256: 6876f9485a399575de4bb381ccf313b6488bd98bc1577a77753bb28ce72bcc3e
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 external PDF files, suggesting a link farm or SEO manipulation tactic. One prominent URL, "https://ttraff.ru/pify?keyword=modified+bessel+equation+pdf", is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, indicating an attempt to disguise malicious content as a technical document. The presence of numerous links and the malicious redirector strongly suggest a phishing or scam attempt.

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=modified+bessel+equation+pdf
    • http://sosujome.scottsier.com/uploads/1/3/1/3/131379296/7748942.pdf
    • http://files.memoriestomasterpiece.com/uploads/1/3/1/0/131070109/rofebaperifa.pdf
    • http://wajine.highballhijinks.com/uploads/1/3/0/9/130969465/f6fa89a013dc.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0431/1479/1068/files/fupopopaboboriwijaduxeno.pdf
    • https://cdn.shopify.com/s/files/1/0429/8683/2035/files/97229472327.pdf
    • https://cdn.shopify.com/s/files/1/0430/3293/6605/files/46063445547.pdf
    • https://cdn.shopify.com/s/files/1/0439/3140/2395/files/prove_it_excel_2010_test_cheat_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0431/1144/8727/files/install_spark_on_mac.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/sort_a_dictionary_by_key_python.pdf
    • https://cdn.shopify.com/s/files/1/0448/0778/2557/files/local_anaesthesia_in_dentistry.pdf
    • https://cdn.shopify.com/s/files/1/0431/7990/1096/files/69834172445.pdf
    • https://cdn.shopify.com/s/files/1/0437/4547/6762/files/40626702900.pdf
    • https://cdn.shopify.com/s/files/1/0437/5265/2951/files/55814652196.pdf
    • https://cdn.shopify.com/s/files/1/0428/1283/3959/files/zanoxexemakokigatirapiz.pdf
    • https://cdn.shopify.com/s/files/1/0434/7206/0573/files/41682152456.pdf
    • https://cdn.shopify.com/s/files/1/0432/6028/0982/files/executive_summary_report_examples.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010f9b.bin
c5d3689c2854694bed6fbd0c809f7d670b9c68456c8c751c968092268a4efc8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9B 5092 bytes
font_01_sfnt_off000120f9.bin
a9a443d42523bbdc562c9fc3b059f4525657395e6f7e9664faa87ff578c20b74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120F9 19148 bytes
font_02_sfnt_off00015d16.bin
bfed58f68a851050fd7dd619caedb2e861bc489711aa2d761a25ea4d8ba48dc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15D16 16572 bytes
font_03_sfnt_off000173cc.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x173CC 4324 bytes

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