Malicious PDF — malware analysis report

Static analysis result for SHA-256 636c83c671b485c7…

MALICIOUS

PDF

45.3 KB Created: 2020-09-07 20:44:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff42d42b438b2239cae83f1628b2a0bf SHA-1: 4365388f620ea71882d57b4b1b1ea49748292918 SHA-256: 636c83c671b485c70748c2199a61f3c687065cbacd34d023fa0f1af7689c5ef4
194 Risk Score

Malware Insights

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

The PDF contains a link farm and a specific malicious redirector URL, indicating an attempt to lead the user to malicious content. The heuristic 'SE_ADVANCE_FEE_SCAM_LURE' strongly suggests the document's purpose is to trick users into a financial scam by promising a prize or parcel delivery. The presence of a malicious redirector URL is the primary indicator of the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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.link/wix?keyword=blockman+multiplayer+pro+apk
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/3bf302_6959fb74cd2f47b9bdc4adcd6231a183.pdf
    • https://static.usrfiles.com/ugd/529dbf_964da532af404702835c440a190adc2b.pdf
    • https://static.usrfiles.com/ugd/7820d0_8041b85a5aad4cfb96f30e85e8f1edfa.pdf
    • https://static.usrfiles.com/ugd/957c7b_63518eca1e774f86ae8d9d335470dece.pdf
    • https://static.usrfiles.com/ugd/19ce5d_7d39f8f70157492cb345256d99a81bd2.pdf
    • https://cdn.shopify.com/s/files/1/0433/5733/9807/files/i7-7700k_vs_i5-7600k.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/12339474235.pdf
    • https://cdn.shopify.com/s/files/1/0433/8057/2321/files/55577874772.pdf
    • https://cdn.shopify.com/s/files/1/0431/2760/3354/files/online_collectible_card_games_android.pdf
    • https://static.usrfiles.com/ugd/b8c837_831ea1ebc0e44584ac9a44771be2d06a.pdf
    • https://static.usrfiles.com/ugd/53cfc7_4575b682dd66450c9c9ee38f03a635ee.pdf
    • https://static.usrfiles.com/ugd/05e3ad_a61cce1ad84e4c1b8ee3c983707d74c6.pdf
    • https://static.usrfiles.com/ugd/1acd69_89de8369f7af42478b13f0cf4e9017a3.pdf
    • https://static.usrfiles.com/ugd/bf0735_71d2c3b98a094819a425d9fd2dbcb02c.pdf
    • https://static.usrfiles.com/ugd/724fb5_00406bf851a540059305a9520a0c541e.pdf
    • https://static.usrfiles.com/ugd/429b25_a72c3d8a313242588c4651a06e13f00d.pdf
    • https://static.usrfiles.com/ugd/99afdc_9897a66671ae4e968d752a3118a78fc5.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e3a.bin
c994d5bdf22074c916f2402753145652a4d5d485581d2cf8162a718737257bd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E3A 5116 bytes
font_01_sfnt_off00006f99.bin
15d4269b1f1aef48d9dfd52ec43a76766a109d2d8f5cbeeb79faf57884cc1efb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F99 10360 bytes
font_02_sfnt_off00009351.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9351 16092 bytes

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