Malicious PDF — malware analysis report

Static analysis result for SHA-256 92817e90b2ffa2f5…

MALICIOUS

PDF

46.4 KB Created: 2020-08-15 08:15:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e05a67ea3f6b48617ec8abf4f8311760 SHA-1: de014561e67d5a1b637ece8aef808d392b9cdc57 SHA-256: 92817e90b2ffa2f5ac4e5a991b4bbaa9f1e28940df035cc7387c65fcedab2d00
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'Algebra 2 textbook pdf' and the malicious URL. The ML classifier strongly indicates maliciousness, and the overall structure suggests a lure for users seeking free educational materials, redirecting them to malicious infrastructure.

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.cc/pify?keyword=algebra+2+textbook+pdf
    • http://files.uchabitat.org/uploads/1/3/2/6/132681501/402aa54811.pdf
    • http://files.givinginitiatives.org/uploads/1/3/1/3/131382955/bofun_datiwivej.pdf
    • https://cdn.shopify.com/s/files/1/0440/7800/6437/files/46710492092.pdf
    • https://cdn.shopify.com/s/files/1/0428/2158/3014/files/pazizusawexi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6836/6760/files/baruch_de_spinoza_libros.pdf
    • https://cdn.shopify.com/s/files/1/0428/6935/8758/files/doki_doki_literature_club_base64.pdf
    • https://cdn.shopify.com/s/files/1/0432/7201/1941/files/arm_dumbbell_exercises.pdf
    • https://cdn.shopify.com/s/files/1/0436/6660/4182/files/fuzawixujobigafit.pdf
    • https://cdn.shopify.com/s/files/1/0431/9471/2228/files/5386529881.pdf
    • https://cdn.shopify.com/s/files/1/0443/6351/4012/files/2002_ap_calculus_ab_free_response.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tedogunugovosilogupex.pdf
    • https://cdn.shopify.com/s/files/1/0432/4245/5207/files/appropriate_preposition_dictionary.pdf
    • https://cdn.shopify.com/s/files/1/0430/3015/1330/files/gopimaw.pdf
    • https://cdn.shopify.com/s/files/1/0434/1386/4604/files/25429548033.pdf
    • https://cdn.shopify.com/s/files/1/0449/7191/7471/files/asean_regional_forum.pdf
    • https://cdn.shopify.com/s/files/1/0440/5598/6326/files/69171044391.pdf
    • https://cdn.shopify.com/s/files/1/0429/1251/4204/files/ad_d_second_edition.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007592.bin
13141b0830413e227517f9046e7192c7fb05a26e5277ba5e606ad5a84624653a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7592 5424 bytes
font_01_sfnt_off00008819.bin
c1e6ca90b2602a43e8b3360c0e25e15d0015edaf0029c874e7dc4f15bd2b610b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8819 10712 bytes

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