Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0519b2a821f2d1f…

MALICIOUS

PDF

52.8 KB Created: 2020-09-07 11:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 26200d80f1a9dbb0b7c3199fafbcc5ad SHA-1: 3b8d04d5ba0a6fa00bc38f91ad81ca0bfb95b7f3 SHA-256: e0519b2a821f2d1f61d39c78a44e38f0fb9d67a57fadd65c9048fdc6f062c5c5
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF was flagged for containing a large number of external links, including one pointing to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and URLs, suggesting an attempt to disguise the malicious intent. The primary attack pattern involves luring the user to a malicious site via these 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.link/wix?keyword=splatoon+bamboozler+guide
    • https://static.usrfiles.com/ugd/921909_52a2d4b6895c4406866e9d33400fad9b.pdf
    • https://static.usrfiles.com/ugd/9c0842_c2ae718755944026b8fdb8745f586104.pdf
    • https://static.usrfiles.com/ugd/b88e3d_bd7e03e001cc47949ccca9cbede092cd.pdf
    • https://static.usrfiles.com/ugd/66f3f9_23ec3be256404e6ebff1120522bc3e8c.pdf
    • https://static.usrfiles.com/ugd/89064d_23194bfebc2e4ea59f4f4290d9dbdc0a.pdf
    • https://static.usrfiles.com/ugd/0fdb6d_db84001210e745ff8c09cc726f26d397.pdf
    • https://static.usrfiles.com/ugd/9f6a24_d44cdf075b7b446486c9b102a05fb987.pdf
    • https://static.usrfiles.com/ugd/d2057d_87b1c21ee2e7480c9cd66797cbd37607.pdf
    • https://static.usrfiles.com/ugd/c20ea7_cc1e9b6bb4524741bd48db0cbdcc044d.pdf
    • https://cdn.shopify.com/s/files/1/0435/6335/2227/files/16717420198.pdf
    • https://cdn.shopify.com/s/files/1/0438/0511/4528/files/agama_islam_sebagai_agama_rasmi.pdf
    • https://cdn.shopify.com/s/files/1/0433/9728/3992/files/7894092548.pdf
    • https://cdn.shopify.com/s/files/1/0437/8863/2213/files/quantitative_aptitude_short_tricks_download.pdf
    • https://cdn.shopify.com/s/files/1/0428/7938/5766/files/18119207253.pdf
    • https://cdn.shopify.com/s/files/1/0432/4681/3344/files/albinismo_oculo_cutan.pdf
    • https://cdn.shopify.com/s/files/1/0433/9371/2286/files/97491948803.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_off00007330.bin
c9dc79a0cbc3dc12eff0a5a0fef3eb2746f6a9479a1bea890b65970d0a6b83c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7330 4216 bytes
font_01_sfnt_off0000820d.bin
406bb4f58a20073591e62a20fd33053554cc4ca75b10f60ac416c335059c7af4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x820D 5276 bytes
font_02_sfnt_off000093dd.bin
fa424ebd05ae6d0efdd2e63b7f38e201d625e58501d04365138f7221392aa778		 pdf-font-stream PDF embedded font (sfnt) at offset 0x93DD 10684 bytes
font_03_sfnt_off0000b7a7.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB7A7 4324 bytes

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