Malicious PDF — malware analysis report

Static analysis result for SHA-256 cff5429baae43205…

MALICIOUS

PDF

57.2 KB Created: 2020-09-13 00:39:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5d0ddab480e843406e42516b00adeb4 SHA-1: 7a3dddcf421c8789c9d72f2f03cd2bd43528cfbd SHA-256: cff5429baae43205ba7e7dc46803d632f312b94f99084f8760f4c31d6e2c84b8
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains embedded links to known malicious redirectors and a large farm of external PDF links, indicating a malicious intent to redirect users to harmful sites or distribute further malware. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, but the presence of numerous suspicious URLs is sufficient evidence.

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.link/wix?keyword=three+houses+skills+guide
    • http://files.supercontinent-bp.com/uploads/1/3/0/8/130873840/f14588.pdf
    • http://sovimovi.wyckedzplace.com/uploads/1/3/0/7/130740571/1ed22.pdf
    • http://files.sfvcca.org/uploads/1/3/1/4/131437295/46bbf84e7ed.pdf
    • https://cdn.shopify.com/s/files/1/0435/4159/4266/files/1918067014.pdf
    • https://cdn.shopify.com/s/files/1/0435/5925/6232/files/no_manches_frida_free_download_mp4.pdf
    • https://cdn.shopify.com/s/files/1/0428/6126/5062/files/godogoluxavo.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/learn_css.pdf
    • https://cdn.shopify.com/s/files/1/0432/2371/1903/files/bsl_fingerspelling_alphabet.pdf
    • https://cdn.shopify.com/s/files/1/0438/3493/3398/files/lubomililatokerupivutow.pdf
    • https://cdn.shopify.com/s/files/1/0437/5429/1354/files/ceneval_guia_interactiva_apk.pdf
    • https://cdn.shopify.com/s/files/1/0466/8814/1476/files/definicion_de_pedagogia_segun_diferentes_autores.pdf
    • https://cdn.shopify.com/s/files/1/0430/6262/4405/files/67642059138.pdf
    • https://cdn.shopify.com/s/files/1/0435/2914/2426/files/hr_kpi_template_excel.pdf
    • https://cdn.shopify.com/s/files/1/0429/6874/4087/files/second_skin_starfinder.pdf
    • https://cdn.shopify.com/s/files/1/0431/1410/2941/files/50991219437.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/

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009018.bin
83a5f4cc96ab7f2c44ea69e4a21e030409ebc4ca468deae506f962728241f446		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9018 4588 bytes
font_01_sfnt_off00009fb5.bin
5e3370020d5f3080393b6d9f0beaecc030a8aa521ce63ef84400a0afcd3dd8b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FB5 13100 bytes
font_02_sfnt_off0000c92b.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC92B 4324 bytes

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