Malicious PDF — malware analysis report

Static analysis result for SHA-256 abcd5f17b8947ace…

MALICIOUS

PDF

48.3 KB Created: 2020-08-06 11:04:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7597386627fb6dce0de7317403a428c SHA-1: 82ee5ad93a901d1c8253d1a2234bc4ab286d6fe4 SHA-256: abcd5f17b8947ace606d20d3e66da3ba4f98bd0d46f923567f69c3992927280b
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to a known malicious redirector, and another for containing a large link farm. The document body contains the URL that triggered the redirector heuristic, suggesting the document's purpose is to lure users to malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, limiting the ability to determine specific payload delivery mechanisms.

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.com/pify?keyword=adjetivos+comparativos+en+ingles+lista+pdf
    • http://jasonusap.completecarechiropractictables.com.au/uploads/1/3/1/6/131607600/4531404.pdf
    • http://files.jaynestrail.com/uploads/1/3/1/3/131384400/noxideroxosesatuf.pdf
    • http://files.grupohedima.com/uploads/1/3/2/6/132681576/gewagikef-jemivixolom-bebodetukududo.pdf
    • http://files.robertson.ie/uploads/1/3/1/4/131453432/rerow.pdf
    • https://cdn.shopify.com/s/files/1/0428/1594/6911/files/sound_pollution_in_telugu.pdf
    • https://cdn.shopify.com/s/files/1/0437/1313/4757/files/38721626793.pdf
    • https://cdn.shopify.com/s/files/1/0433/4649/3605/files/rajuv.pdf
    • https://cdn.shopify.com/s/files/1/0434/8379/1517/files/dobopuxeririjozago.pdf
    • https://cdn.shopify.com/s/files/1/0433/9623/5415/files/zener_and_avalanche_breakdown.pdf
    • https://cdn.shopify.com/s/files/1/0427/9504/0924/files/91140541624.pdf
    • https://cdn.shopify.com/s/files/1/0434/6983/2357/files/importancia_de_la_alimentacion_en_el_embarazo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1624/0807/files/list_of_valid_email_addresses.pdf
    • https://cdn.shopify.com/s/files/1/0432/3858/8584/files/xekoxoxowosuzawur.pdf
    • https://cdn.shopify.com/s/files/1/0438/7730/2427/files/jipamoradovoxipunox.pdf
    • https://cdn.shopify.com/s/files/1/0432/7407/6315/files/buwufowasezedevum.pdf
    • https://cdn.shopify.com/s/files/1/0437/3004/3041/files/dreadlock_holiday_lyrics.pdf
    • https://cdn.shopify.com/s/files/1/0433/7238/0318/files/wozuviludog.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_off000060bb.bin
b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60BB 6744 bytes
font_01_sfnt_off000071a0.bin
a2aea88edf87972bd3ce0ff15410dc780c206b2df8d0d35a1026ba681e2e5416		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71A0 5600 bytes
font_02_sfnt_off000084a7.bin
0814faaae07219f2457bfc72754b776eea4d7766e913eeb80af492ea68d852f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84A7 15064 bytes

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