Malicious PDF — malware analysis report

Static analysis result for SHA-256 f729bfcc6674c804…

MALICIOUS

PDF

54.2 KB Created: 2020-09-06 16:57:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d57bbb26d968b32ccfe1ca44e5360ad7 SHA-1: 0e40bdde654ded68f06c26cdfabcf544c837d531 SHA-256: f729bfcc6674c804963051780fd37a4362998fe722879455e067b03b4e293519
152 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by an ML classifier and contains a link to a known malicious redirector. It also exhibits characteristics of a PDF link farm, with 28 external links, many pointing to Shopify domains. The document body contains garbled text but includes the malicious URL and several benign-looking PDF URLs, suggesting a lure or redirection mechanism.

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.club/wix?keyword=all+gangster+games+free
    • https://cdn.shopify.com/s/files/1/0429/3653/3151/files/33019894927.pdf
    • https://cdn.shopify.com/s/files/1/0439/1917/9931/files/8299327606.pdf
    • https://cdn.shopify.com/s/files/1/0432/9360/6046/files/b_ed_degree_form_vnsgu.pdf
    • https://static.usrfiles.com/ugd/b8c837_6ca6542135bd4338936826dc674c0e5c.pdf
    • https://static.usrfiles.com/ugd/b8c837_011cb1c16cc1455e9a0c6e68e1e63d31.pdf
    • https://static.usrfiles.com/ugd/f2c1dc_d2a74706a3884aabba36b053ea109913.pdf
    • https://static.usrfiles.com/ugd/9421c8_4178d5e3f54d46898fc673a4175bd372.pdf
    • https://cdn.shopify.com/s/files/1/0430/3526/3138/files/favubidabiruj.pdf
    • https://cdn.shopify.com/s/files/1/0431/2917/6232/files/72811237641.pdf
    • https://cdn.shopify.com/s/files/1/0436/4691/0624/files/vonepozutubapotefigulujuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/0601/7185/files/android_modal_dialog.pdf
    • https://static.usrfiles.com/ugd/738632_0fc70812f9ea4160bf58f9b54d0603f2.pdf
    • https://static.usrfiles.com/ugd/b8c837_2a4cd7e5bdb84ac685d4471abb899625.pdf
    • https://static.usrfiles.com/ugd/724fb5_65a37cc973b8447a858be437ac168edc.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000708d.bin
3162272a4271a3092469d484e8b786e439262fe9b21486fbfede4b0984a0b5ea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x708D 5076 bytes
font_01_sfnt_off000081b4.bin
53f31dc128995b8c451b51672109cf3ca29746b7f236df6ca8f6164f93d36f4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81B4 6040 bytes
font_02_sfnt_off00009320.bin
e735381d71a562a09bd3fb3cd49f7eb8ccc6389fdc3983206e70e78402972e9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9320 10092 bytes
font_03_sfnt_off0000b5ec.bin
d1563e324b4742f7f999df30ca09f75491aceadef93ab47332ec55b7f88c94bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5EC 16300 bytes

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