Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9ea237331250a2…

MALICIOUS

PDF

54.1 KB Created: 2020-08-14 12:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 97883d2b12c625f9a2f51ba18513fede SHA-1: 73af4251ca85099a34d9eb751e49ddc7d6766396 SHA-256: 5f9ea237331250a24b9ce0a123f3c583bb6a0f5d1de1c21aa8a1797701275db8
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to Shopify domains hosting other PDFs, but one critical link directs to a known malicious redirector. This suggests a link farm or SEO poisoning tactic to disguise malicious activity. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs indicates an attempt to redirect the user 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.ru/pify?keyword=best+arabic+keyboard+for+android+apk
    • http://tezubut.feng-ge.net/uploads/1/3/0/9/130969723/muwotupoge.pdf
    • http://files.elegantedetailssalon.net/uploads/1/3/2/3/132302970/rurilativelowo.pdf
    • http://xojuxi.giaddiecreations.com/uploads/1/3/0/7/130738970/2d2c75.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.opentle.org
    • https://cdn.shopify.com/s/files/1/0428/6955/5359/files/modekamewi.pdf
    • https://cdn.shopify.com/s/files/1/0427/8750/4294/files/basic_branches_of_philosophy.pdf
    • https://cdn.shopify.com/s/files/1/0433/7994/9718/files/93674732313.pdf
    • https://cdn.shopify.com/s/files/1/0441/4128/1432/files/eye_normal_map_fix.pdf
    • https://cdn.shopify.com/s/files/1/0435/5837/1496/files/dikikubikogo.pdf
    • https://cdn.shopify.com/s/files/1/0431/1020/3545/files/63612770836.pdf
    • https://cdn.shopify.com/s/files/1/0432/3826/0899/files/58822191888.pdf
    • https://cdn.shopify.com/s/files/1/0434/1324/2005/files/99635681638.pdf
    • https://cdn.shopify.com/s/files/1/0440/5261/1222/files/66774765675.pdf
    • https://cdn.shopify.com/s/files/1/0429/8421/0583/files/88831661306.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
    • http://www.gnu.org/licenses/gpl.html
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f73.bin
6e5420dac303cb9fcf468d64854e686750aa108b50be7106697e87ada25f6491		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F73 5472 bytes
font_01_sfnt_off0000721d.bin
4b2c53a9ebca111f0a79c18847404ec6f91ab95fb2e56e143fb4380dc69c5511		 pdf-font-stream PDF embedded font (sfnt) at offset 0x721D 8680 bytes
font_02_sfnt_off00008a5e.bin
e6bff2a36657f1bcbee13ba411fecc98ed077faef3f2796c6647a9bd75d95554		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A5E 10420 bytes
font_03_sfnt_off0000ae35.bin
f11ca289dbac39d12f0f71498eb16d078e8df6f690eda9b338b560a7d1f94bf0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE35 18328 bytes

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