Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a7b522bce1f24a…

MALICIOUS

PDF

47.9 KB Created: 2020-08-15 14:44:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: de63e5c9d6ba94b32603ad504fc29685 SHA-1: e122233e4f6966aa236a2f65a9d0d02a6828fa36 SHA-256: e3a7b522bce1f24ad7869fe288e2eae888ffbde74bf8d6cc0df5b6884f34706b
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one critical heuristic firing indicating a link to known malicious redirector infrastructure. Another critical heuristic identifies this as a PDF link farm, likely for SEO spam or to obscure malicious destinations. The document body contains garbled text and a URL that appears to be part of the link farm. No scripts were extracted, but the sheer volume of links and the presence of a malicious redirector strongly suggest a malicious intent to lure users to harmful sites.

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.cc/pify?keyword=amsler+grid+chart
    • http://regetesi.enactyourfuture.com/uploads/1/3/1/4/131482933/fasefekajopidowa.pdf
    • http://files.efhsvolleyballboosterclub.org/uploads/1/3/0/8/130813710/3245133.pdf
    • https://cdn.shopify.com/s/files/1/0429/5124/5987/files/47015305893.pdf
    • https://cdn.shopify.com/s/files/1/0431/2668/5850/files/xemesobikijegutij.pdf
    • https://cdn.shopify.com/s/files/1/0434/0593/4757/files/17818054227.pdf
    • https://cdn.shopify.com/s/files/1/0434/2795/4840/files/88691683690.pdf
    • https://cdn.shopify.com/s/files/1/0433/8181/7495/files/pip_claim_form_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/5318/7223/files/1077534511.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/lufixupiz.pdf
    • https://cdn.shopify.com/s/files/1/0437/1510/0826/files/july_calendar_2020_printable.pdf
    • https://cdn.shopify.com/s/files/1/0428/4973/0727/files/15616868879.pdf
    • https://cdn.shopify.com/s/files/1/0431/7157/8024/files/4153820452.pdf
    • https://cdn.shopify.com/s/files/1/0436/7931/8166/files/56057061375.pdf
    • https://cdn.shopify.com/s/files/1/0434/4627/2162/files/19599804230.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4481/files/wunowiripafegoda.pdf
    • https://cdn.shopify.com/s/files/1/0434/7029/1096/files/52882096544.pdf
    • https://cdn.shopify.com/s/files/1/0438/8136/5659/files/fukeloralerazu.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_off0000707e.bin
aaa26cbf8764763e870976b46df78d6c6ec9de6b8a6c327019779e2b8cb13756		 pdf-font-stream PDF embedded font (sfnt) at offset 0x707E 4912 bytes
font_01_sfnt_off00008121.bin
c4ef9154d8c777f752b9fc119b9d5e6389e81c89710356e91d075b2536b18ff6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8121 10412 bytes
font_02_sfnt_off0000a4b8.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4B8 4324 bytes

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