Malicious PDF — malware analysis report

Static analysis result for SHA-256 758b685158ed5515…

MALICIOUS

PDF

45.7 KB Created: 2020-10-12 01:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 09df2db3922820df3b11573fa7ac7056 SHA-1: 88fe12b9d5e9dff9cdeab64d247d75da6c36315d SHA-256: 758b685158ed5515ef44319383a8e84684e3a81fa87d01f97d504acb476fd38c
162 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains the same URL, suggesting a lure for users to click on it. The PDF_SEO_LINK_FARM heuristic further indicates a pattern of hosting numerous PDFs on potentially malicious domains.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/pify?keyword=daily+language+review+grade+4+answer+key+pdf+emc+582 In PDF document text
    • http://kamuz.wellspringacres.com/uploads/1/3/0/9/130969186/3625395.pdfIn PDF document text
    • http://files.sweetdreamsweddingflowers.com/uploads/1/3/1/1/131163599/jiwedimamijep.pdfIn PDF document text
    • http://files.dulyon.com/uploads/1/3/0/8/130874113/nerefif.pdfIn PDF document text
    • http://padurotut.incubator143.org/uploads/1/3/1/3/131379394/4068087.pdfIn PDF document text
    • https://site-1039268.mozfiles.com/files/1039268/muvanepefixarizamaramoj.pdfIn PDF document text
    • https://site-1043660.mozfiles.com/files/1043660/tanusovekevoto.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0461/3655/7736/files/dovufesonijitatipedagapip.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9938/1159/files/30_amp_gfci_breaker.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0484/0213/7245/files/13135660812.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8967/3883/files/moviestarplanet_hack_tool_usage.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9085/4566/files/history_one_direction_lyrics_chords.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0496/1376/6820/files/54751004538.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0486/1686/5952/files/chip_foose_built_cars_for_sale.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0485/3756/7387/files/c_major_scale_positions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0266/7882/1051/files/58359958841.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006fcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FCC 6332 bytes
SHA-256: f823659b53169bf15b63659074ad4deaa1f0f344d2d531179bcd848d0c35c005
font_01_sfnt_off0000856f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x856F 10568 bytes
SHA-256: 7e457609f76a39c34429c668a642bdec427288d68a9e15d69fd9d528ce44986a

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