Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d8492361aa851e…

MALICIOUS

PDF

106.2 KB Created: 2020-08-26 17:15:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e7b8fad7caf145503bac9bb19506850 SHA-1: a66bdce4ae33dba31b2749e6f32e7dc3213e693b SHA-256: 22d8492361aa851eb431632f7d9119d2b0c65ec84ce14a32a5d26a2be5302dcd
152 Risk Score

Malware Insights

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

The PDF document was flagged by multiple critical heuristics for containing links to known malicious redirector infrastructure and for being part of a link farm. The ML classifier also strongly indicated maliciousness. The primary malicious IOC is the redirector URL, which likely serves as a gateway to further malicious content or phishing pages. The document body itself is heavily obfuscated and appears to contain a large number of embedded URLs, including the malicious redirector and numerous benign-looking Shopify links, suggesting a tactic to obscure malicious activity or for SEO manipulation.

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.com/pify?keyword=%25D8%25A3%25D9%2586%25D8%25B4%25D8%25A6+%25D8%25AF%25D9%2585%25D9%258A%25D8%25AA%25D9%2583+%25D8%25A7%25D9%2584%25D8%25AE%25D8%25A7%25D8%25B5%25D8%25A9+%25D8%25B9%25D9%2584%25D9%2589+%25D8%25A7%25D9%2584%25D8%25A5%25D9%2586%25D8%25AA%25D8%25B1%25D9%2586%25D8%25AA
    • http://lotororus.smalltowndiycreations.com/uploads/1/3/0/7/130776769/aa8d17e553.pdf
    • http://files.altenergytrump.com/uploads/1/3/2/7/132740181/dagezegixuxik.pdf
    • https://cdn.shopify.com/s/files/1/0431/6997/2384/files/ritikig.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gizazuvolabemonixodokij.pdf
    • https://cdn.shopify.com/s/files/1/0437/5537/2695/files/69690368708.pdf
    • https://cdn.shopify.com/s/files/1/0431/0643/5232/files/87341461203.pdf
    • https://cdn.shopify.com/s/files/1/0436/9684/9051/files/table_of_contents_worksheets_for_2nd_grade.pdf
    • https://cdn.shopify.com/s/files/1/0438/4551/7469/files/52807482979.pdf
    • https://cdn.shopify.com/s/files/1/0437/0887/4906/files/nemebigu.pdf
    • https://cdn.shopify.com/s/files/1/0433/7631/2478/files/77049254204.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/garul.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0427/files/30691831789.pdf
    • https://cdn.shopify.com/s/files/1/0459/9237/8527/files/kewexopivid.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5510/files/4740190335.pdf
    • https://cdn.shopify.com/s/files/1/0432/1440/5793/files/42834837355.pdf
    • https://cdn.shopify.com/s/files/1/0431/8606/1480/files/xopisix.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
stream_006_off00015e97.bin
21bdbe661ccfb19aee7706659383203e738d99759a1902abb0200ac55792685e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15E97 34028 bytes
font_00_sfnt_off00011751.bin
88b4df287869f8a87cfca73fa70e055f9c8c0ff4f418bc447a4fa7089e3d2d74		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11751 4068 bytes
font_01_sfnt_off00012530.bin
653e0b63e65cc1c57ade91e4f7dc42a96e637f9e44c93a8a28794b74738e0c36		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12530 18732 bytes
font_02_sfnt_off0001427d.bin
209355765910a8ed1602fef9f3bc78f9c7809b87681ba2c4d56545a9f6dc27e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1427D 8192 bytes

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