Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ccd2408cbfec05a…

MALICIOUS

PDF

53.0 KB Created: 2020-08-31 00:28:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d261050e857aad2d33c92825d43bc4e1 SHA-1: 42208fee4633258fb97698239698d67e7965af49 SHA-256: 2ccd2408cbfec05aa22c15c328c506ded22689dafd2796b58e86a2de79c8235e
152 Risk Score

Malware Insights

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

The PDF file was identified as malicious due to a critical heuristic firing for a redirector link to a known malicious infrastructure. Additionally, it contains a large link farm, suggesting an attempt to manipulate search engine results or distribute malicious content. The primary IOC is the redirector URL, which is likely the initial point of compromise.

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.me/wix?keyword=tu+cara+me+suena+laura+esquivel+loco
    • https://static.usrfiles.com/ugd/8ba634_a142acfb78214dbcac03a90a3a5eecdd.pdf
    • https://static.usrfiles.com/ugd/1cc7e8_89991027bd0d48c99564a0295820d1ac.pdf
    • https://static.usrfiles.com/ugd/b8c837_60a768afe3bb40668840153a44651bf2.pdf
    • https://static.usrfiles.com/ugd/b4a829_f664228ea1ec474caef1a04f034b5c57.pdf
    • https://static.usrfiles.com/ugd/5cf23b_549f5a6e2f854e349a3ab4e4962d1bbd.pdf
    • https://static.usrfiles.com/ugd/724bd4_b1a082de207c42f8be3458a15f63d21d.pdf
    • https://static.usrfiles.com/ugd/de3d83_e647e1a36306425e82df2cc3491546e6.pdf
    • https://static.usrfiles.com/ugd/5d2cf3_664abc8f64d14eb691b7b96c415b3005.pdf
    • https://static.usrfiles.com/ugd/1cc7e8_085f638cb06b44ff818d8f0a520b7a5f.pdf
    • https://cdn.shopify.com/s/files/1/0431/4506/8699/files/91948506732.pdf
    • https://cdn.shopify.com/s/files/1/0430/0269/1743/files/advanced_highway_and_transportation_engineering.pdf
    • https://cdn.shopify.com/s/files/1/0437/0877/6599/files/56104209554.pdf
    • https://cdn.shopify.com/s/files/1/0431/3445/1874/files/vajuvufisunad.pdf
    • https://cdn.shopify.com/s/files/1/0435/1180/8155/files/62221924120.pdf
    • https://cdn.shopify.com/s/files/1/0433/8148/9813/files/92209338005.pdf
    • https://cdn.shopify.com/s/files/1/0431/0797/5317/files/24365639037.pdf
    • https://cdn.shopify.com/s/files/1/0438/6160/6565/files/43550277740.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008275.bin
dfe900102aa69efbee82099720fe491272fe91e2fd73a76f668d366ca28e7964		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8275 4884 bytes
font_01_sfnt_off000092ee.bin
8f5f2e275c93cd3e13cac53ec380271f0bc0641a1d261305adb46566e42e9ac8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92EE 11544 bytes
font_02_sfnt_off0000b8a1.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB8A1 4324 bytes

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