Malicious PDF — malware analysis report

Static analysis result for SHA-256 eda92d1115bd5e3b…

MALICIOUS

PDF

45.9 KB Created: 2020-08-07 08:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 07b6e54770049835fc5580bc043380aa SHA-1: fa2433e41b8ca380960ca2c82526c33a567675e1 SHA-256: eda92d1115bd5e3b5bd4e07019f14064bcc3878e2710181ca0d0b273d1763838
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains the URL https://ttraff.cc/pify?keyword=building+drawing+plan+elevation+section+pdf, which is the primary indicator of malicious intent. This URL likely serves as a lure to a malicious site, potentially for phishing or malware distribution. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm used for SEO poisoning or to obscure the ultimate destination.

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=building+drawing+plan+elevation+section+pdf
    • http://files.tnusd1812.com/uploads/1/3/1/4/131409597/bazunex.pdf
    • http://files.hamcmaine.com/uploads/1/3/1/4/131407423/ninujewasot.pdf
    • http://files.nancykasprzyk-colorado.com/uploads/1/3/0/7/130775025/51fa49ea37.pdf
    • http://files.authormichaelduncan.com/uploads/1/3/1/3/131383864/vegumatonof.pdf
    • https://cdn.shopify.com/s/files/1/0438/2484/0861/files/51531561812.pdf
    • https://cdn.shopify.com/s/files/1/0436/7400/9753/files/email_writing_examples_for_students.pdf
    • https://cdn.shopify.com/s/files/1/0434/3319/7718/files/wetabe.pdf
    • https://cdn.shopify.com/s/files/1/0430/1144/0803/files/62678910205.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/23582012054.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/78214852322.pdf
    • https://cdn.shopify.com/s/files/1/0437/3191/0810/files/rexosekute.pdf
    • https://cdn.shopify.com/s/files/1/0438/4702/4805/files/49412121511.pdf
    • https://cdn.shopify.com/s/files/1/0438/3758/7606/files/dedafaxavewup.pdf
    • https://cdn.shopify.com/s/files/1/0430/8634/8450/files/26613749798.pdf
    • https://cdn.shopify.com/s/files/1/0431/6584/3620/files/9382979080.pdf
    • https://cdn.shopify.com/s/files/1/0430/0324/8803/files/adobe_reader_apk_for_windows_8.pdf
    • https://cdn.shopify.com/s/files/1/0429/8869/9802/files/97854102459.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_off00006945.bin
1b356f81c55b1232e7a072a5f61095d77ad85117f96ae6f273b51c730bfc23c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6945 5408 bytes
font_01_sfnt_off00007bc4.bin
104609e3f0bc805308b09129c9640259df974fdac0cb059781e5410dd7d29a22		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BC4 9444 bytes
font_02_sfnt_off00009c21.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C21 4324 bytes

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