Malicious PDF — malware analysis report

Static analysis result for SHA-256 74c6c19696820c95…

MALICIOUS

PDF

71.2 KB Created: 2020-08-25 13:55:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7ee643682ea63ce078df4499db8ee28a SHA-1: 8a6a775d21820909f6f83bb1fb9aa6a751aaa838 SHA-256: 74c6c19696820c95e018e0f690b65c89628a273ff83ba92d1a15e312bbeddf5d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, many of which point to a redirector service. The primary malicious link, 'https://ttraff.cc/pify?keyword=dreambox+learning+android+app', suggests a lure related to Android apps. The ML classifier strongly indicated maliciousness, and the presence of a link farm heuristic confirms the intent to distribute links.

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=dreambox+learning+android+app
    • http://duwom.dpcoachingcentre.com/uploads/1/3/0/9/130968921/lawoma.pdf
    • http://files.regalawardsde.org/uploads/1/3/1/3/131383544/7956350.pdf
    • http://files.thelale.com/uploads/1/3/1/4/131452735/xapifodawa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/lecture_notes_on_data_structures_and_algorithms_using_c.pdf
    • https://cdn.shopify.com/s/files/1/0428/4622/4551/files/kugutapafapukigafixov.pdf
    • https://cdn.shopify.com/s/files/1/0433/0491/1006/files/jugubamusika.pdf
    • https://cdn.shopify.com/s/files/1/0466/3079/7477/files/jonubinamogodewajut.pdf
    • https://cdn.shopify.com/s/files/1/0437/8437/2386/files/matplotlib_dynamic_plot.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9927/files/31246071353.pdf
    • https://cdn.shopify.com/s/files/1/0431/4061/2262/files/56614058796.pdf
    • https://cdn.shopify.com/s/files/1/0431/4834/5500/files/bride_of_the_century_episode_10.pdf
    • https://cdn.shopify.com/s/files/1/0459/2258/2679/files/cherry_fruit_information.pdf
    • https://cdn.shopify.com/s/files/1/0450/9948/3301/files/c_stl_iterator_implementation.pdf
    • https://cdn.shopify.com/s/files/1/0432/3137/9619/files/29497437925.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ca5.bin
ee6f16e0c8fbbdb31aff1aaf3ce7e76a5fe775949f4c4bd5e090cddb5182f6aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7CA5 6676 bytes
font_01_sfnt_off00008d7d.bin
19cad1d7e63f9bac3322e41c50746b43d72c3e6329383969ecaed4b2fc8aa47b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D7D 5308 bytes
font_02_sfnt_off00009f6b.bin
2f6bd37d8dd093ff8839706754de6a8827d546675b8a85b8a74021f43ceafe34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F6B 15728 bytes
font_03_sfnt_off0000c1da.bin
7c17bf16236c12b58a175ec492de4fbaaf340bb1ad139619a0fa8d83cd73d2e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC1DA 13720 bytes
font_04_sfnt_off0000eda7.bin
14f4fdbb1c1f03b51b28432fd4af0aa8e9554b673323288907526c9dccc06145		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA7 18280 bytes
font_05_sfnt_off00010710.bin
f0a88f0ebc5209daefb10e1ce02cecb9ab784a7a91854bfb646a3c59a620ceda		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10710 1748 bytes

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