Malicious PDF — malware analysis report

Static analysis result for SHA-256 6147aebd6ca4959b…

MALICIOUS

PDF

44.7 KB Created: 2020-08-12 02:48:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ec5077d67aa33a88956957a6dcd7cf33 SHA-1: 181362ecd7c8149c48175ee9c7b8176756fbefd1 SHA-256: 6147aebd6ca4959b54f36d8d7741fd9576535270e529579055182a64766ed008
194 Risk Score

Malware Insights

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

The PDF document contains a lure related to an academic answer key, but embeds a link to a known malicious redirector. The document also features a large number of links to other PDFs hosted on Shopify, suggesting a link farm for SEO manipulation or to obscure the malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL confirms the malicious intent.

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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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=oxidative+phosphorylation+pogil+pdf+answer+key
    • http://files.handfelted.com/uploads/1/3/2/3/132302894/kinipekelukipo-zerunixamorukat.pdf
    • http://files.tulelakecycles.com/uploads/1/3/0/7/130775242/2374964.pdf
    • http://files.tandesoleilmorrobay.com/uploads/1/3/0/8/130814118/07e57.pdf
    • http://files.bhlexvolunteers.com/uploads/1/3/0/8/130874539/7bd20.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0439/8009/5646/files/55874816374.pdf
    • https://cdn.shopify.com/s/files/1/0435/3094/4671/files/36425107924.pdf
    • https://cdn.shopify.com/s/files/1/0431/5496/4631/files/vidibozavukonefusabarefun.pdf
    • https://cdn.shopify.com/s/files/1/0435/5276/8151/files/desedokokofowovubumal.pdf
    • https://cdn.shopify.com/s/files/1/0429/7755/8681/files/42319013994.pdf
    • https://cdn.shopify.com/s/files/1/0430/0741/0329/files/90897636251.pdf
    • https://cdn.shopify.com/s/files/1/0430/3287/1074/files/discipleship_bible_study_lessons.pdf
    • https://cdn.shopify.com/s/files/1/0431/1007/2481/files/crit_fail_table.pdf
    • https://cdn.shopify.com/s/files/1/0437/9174/5175/files/math_minutes_5th_grade_worksheets.pdf
    • https://cdn.shopify.com/s/files/1/0434/8212/0358/files/35319755851.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_off00006e7c.bin
bc67a7e79a6ad83cd67e84a50963eca099ed16cb815dcb77f04f69df86ebfc5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E7C 5716 bytes
font_01_sfnt_off00008217.bin
19963149331d692748826508b14ab20b4ef7b5f4c663f31b24f4dbb3b59cc706		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8217 10672 bytes

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