Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5cc8cb8eccd0268…

MALICIOUS

PDF

55.8 KB Created: 2020-08-03 04:42:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 215525acae5aa7da9f19507dabafe1f0 SHA-1: efb9b6b7b24093006717fbf1b3fdd24cfa593ce5 SHA-256: c5cc8cb8eccd026812b2cf53389f30b06a1c793d1f9960dffc82728c1684259b
154 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with one identified as a malicious redirector. The heuristic PDF_SEO_LINK_FARM indicates a large external PDF link farm, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier also strongly flagged this PDF as malicious. The primary malicious IOC is the redirector URL.

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.ru/pify?keyword=eric+whitacre+sleep+sheet+music+pdf
    • http://files.vineleavespress.com/uploads/1/3/0/8/130813855/2033626.pdf
    • http://files.kilimanjarohope.org/uploads/1/3/0/8/130813818/mikudibababuli.pdf
    • http://files.preacherman.org/uploads/1/3/2/6/132682731/7674231.pdf
    • https://cdn.shopify.com/s/files/1/0437/4292/0869/files/99307234560.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/75815848510.pdf
    • https://cdn.shopify.com/s/files/1/0432/6309/9040/files/tojenuwefiwanamiripomado.pdf
    • https://cdn.shopify.com/s/files/1/0428/8957/6601/files/25918931812.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/pidiratilitotew.pdf
    • https://cdn.shopify.com/s/files/1/0434/1039/1207/files/jiwiriluza.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/63537272249.pdf
    • https://cdn.shopify.com/s/files/1/0431/0210/9856/files/20044861503.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/4107173541.pdf
    • https://cdn.shopify.com/s/files/1/0428/7237/3411/files/46781235567.pdf
    • https://cdn.shopify.com/s/files/1/0428/8803/6505/files/575595102.pdf
    • https://cdn.shopify.com/s/files/1/0428/5038/6086/files/58760101077.pdf
    • https://cdn.shopify.com/s/files/1/0433/8001/5262/files/47063996140.pdf
    • https://cdn.shopify.com/s/files/1/0432/5100/7638/files/23970529249.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_off00007a3e.bin
3f7d07e166e589376e041b989fab8c861a41249b743defc4b80bf92d313b3331		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A3E 5112 bytes
font_01_sfnt_off00008bae.bin
8603837d3215376be9de5a70a5491c1090e729b30c27614cb60ecf7ad8d711bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8BAE 9924 bytes
font_02_sfnt_off0000aded.bin
fb7b45e24c28c4473d0ca1c6410c593992d9a809009f9c41b5ae32c9142507dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xADED 16120 bytes
font_03_sfnt_off0000c2d5.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D5 4324 bytes

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