Malicious PDF — malware analysis report

Static analysis result for SHA-256 430890239e1d5975…

MALICIOUS

PDF

44.2 KB Created: 2020-08-04 00:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa0a3218143a3303e8edfce53e62b839 SHA-1: 9f49ef3d340e4b1e491a9a3d31e433fd7e0e07f2 SHA-256: 430890239e1d597593873ea93a7138b9896c447a98cacf2b0cc8a6a7b4d3ca71
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous links, including one pointing to a known malicious redirector at 'ttraff.com'. The document body, though heavily obfuscated, contains text related to 'definite and indefinite articles exercises worksheets' and the malicious URL, suggesting a lure to disguise malicious activity. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm indicates an attempt to distribute malicious content.

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/wb?keyword=definite%20and%20indefinite%20articles%20exercises%20worksheets
    • http://files.roberttally.com/uploads/1/3/2/7/132740249/9731011.pdf
    • http://files.childrenspiazzapeabody.com/uploads/1/3/1/3/131397964/povama.pdf
    • http://files.cafeokawari.com/uploads/1/3/1/3/131384663/vifaf_lalaxel_dokimot_dulavemefolinu.pdf
    • http://files.gilsonns.com/uploads/1/3/1/3/131398367/datiravezoxe.pdf
    • https://cdn.shopify.com/s/files/1/0432/5762/6792/files/22155499419.pdf
    • https://cdn.shopify.com/s/files/1/0429/1778/9862/files/baduwulofibafelime.pdf
    • https://cdn.shopify.com/s/files/1/0434/3139/5493/files/80750216577.pdf
    • https://cdn.shopify.com/s/files/1/0433/0677/8784/files/74524891183.pdf
    • https://cdn.shopify.com/s/files/1/0438/2703/6322/files/probability_concepts_in_engineering_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0433/8126/0440/files/buxesabekokafatemox.pdf
    • https://cdn.shopify.com/s/files/1/0431/4054/6714/files/wufumituvolupaf.pdf
    • https://cdn.shopify.com/s/files/1/0433/4832/8603/files/fefenipumatufomofe.pdf
    • https://cdn.shopify.com/s/files/1/0433/2886/4409/files/weluwunezulelabomane.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/binoluso.pdf
    • https://cdn.shopify.com/s/files/1/0429/1752/7715/files/nogapexuvekefisoluvugigib.pdf
    • https://cdn.shopify.com/s/files/1/0434/0839/2353/files/vajinatobajifawewik.pdf
    • https://cdn.shopify.com/s/files/1/0433/0268/2789/files/47602249479.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_off000060eb.bin
bc13898fa5e12b44685cccf718fc00bcd076f268fdf7bc18f267725ba99f7b93		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60EB 5120 bytes
font_01_sfnt_off0000725d.bin
d31e325f82e526e95b17a706a067f69add983f9b637bcb4becca9e11737e8092		 pdf-font-stream PDF embedded font (sfnt) at offset 0x725D 10060 bytes
font_02_sfnt_off000094cf.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x94CF 4324 bytes

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