Malicious PDF — malware analysis report

Static analysis result for SHA-256 f98a8436d54584c5…

MALICIOUS

PDF

46.3 KB Created: 2020-08-06 23:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38a0b72e630abc639d351e02cc043ea3 SHA-1: d7c93305f4d77527f7b52d095a45b78694d79e7d SHA-256: f98a8436d54584c54a83828e30a1d9a06948161e4a9c827c077e15f212c62a15
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a critical heuristic firing for a malicious redirector. The primary malicious URL is https://ttraff.cc/pify?keyword=simple+biochemistry+book+pdf, which likely serves as a lure to download further malicious content. The document body, though heavily obfuscated, contains references to the lure and the malicious URL, reinforcing the phishing attempt.

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=simple+biochemistry+book+pdf
    • http://files.atxfashionbydesign.com/uploads/1/3/0/7/130739093/boletivivefu-nejig.pdf
    • http://files.restorationmassagebydiana.com/uploads/1/3/1/4/131453106/linuvepomoge_wunexunoresotu_bakiwigolijoge_lijutotoxal.pdf
    • http://wepawi.ebenezerconyers.com/uploads/1/3/2/6/132682883/c6aaf1e4004.pdf
    • http://files.donandmargieabroard.com/uploads/1/3/1/0/131071076/f2b818fc74ed0.pdf
    • http://files.danielkellyfilm.com/uploads/1/3/1/1/131163666/e318ce5086688.pdf
    • https://cdn.shopify.com/s/files/1/0434/5842/9078/files/4420354438.pdf
    • https://cdn.shopify.com/s/files/1/0438/2998/5430/files/dokowirolimuxafupowabof.pdf
    • https://cdn.shopify.com/s/files/1/0431/6292/7253/files/94457983990.pdf
    • https://cdn.shopify.com/s/files/1/0438/0937/4365/files/wifexiregegadatokomoj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53059057271.pdf
    • https://cdn.shopify.com/s/files/1/0437/8673/1671/files/14979118673.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1557/files/nexami.pdf
    • https://cdn.shopify.com/s/files/1/0440/8298/7158/files/brother_hl-_l6200dw_driver.pdf
    • https://cdn.shopify.com/s/files/1/0437/0753/1414/files/26843520212.pdf
    • https://cdn.shopify.com/s/files/1/0433/6451/5994/files/18658098608.pdf
    • https://cdn.shopify.com/s/files/1/0436/0306/7038/files/series_66_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/6017850283.pdf
    • https://cdn.shopify.com/s/files/1/0437/6359/7466/files/dafixu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/65529241957.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/
    • https://cdn.shopify.com/s/files/1

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007691.bin
d768f588866f36ed92eb7fae95f43b904cc1cfad2ef0457081e1049327c33088		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7691 5596 bytes
font_01_sfnt_off00008970.bin
a56a4a952b69ab967659300c50f83b96017a09947f3385152ca0862555a9ef8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8970 10240 bytes

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