Malicious PDF — malware analysis report

Static analysis result for SHA-256 b74134ffb1dee3b7…

MALICIOUS

PDF

42.1 KB Created: 2020-08-27 15:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d558e2fd00ee4b83f0941b9e0be66357 SHA-1: c32fa60aa3ceac6cb66ea3a89001dd3489aeae94 SHA-256: b74134ffb1dee3b75f06054e825cab7bba9a3566af171303c04a5209c3d57f20
152 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to Shopify domains, which is characteristic of SEO link farm techniques. One of these links, 'https://ttraff.cc/pify?keyword=fe+manual+pdf', is identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body itself is largely unreadable binary data, but the presence of the malicious redirector URL is the primary indicator of malicious intent.

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=fe+manual+pdf
    • http://fifid.rachellacey.com/uploads/1/3/1/6/131636948/furuxudawotuworigase.pdf
    • http://ledezav.thehistoryenvelope.com/uploads/1/3/1/4/131406427/kokafux.pdf
    • http://files.thebrainydeafsite.com/uploads/1/3/2/6/132696604/vepotopi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9952/files/waxakifasufawebok.pdf
    • https://cdn.shopify.com/s/files/1/0431/2429/3796/files/larajomomemok.pdf
    • https://cdn.shopify.com/s/files/1/0437/8938/5888/files/44308920995.pdf
    • https://cdn.shopify.com/s/files/1/0438/4958/0704/files/anne_of_green_gables_book_2.pdf
    • https://cdn.shopify.com/s/files/1/0429/6956/3290/files/zuvuturobularabuveverag.pdf
    • https://cdn.shopify.com/s/files/1/0433/3902/2485/files/zefatadolilesezuxelup.pdf
    • https://cdn.shopify.com/s/files/1/0437/3177/9733/files/34327031739.pdf
    • https://cdn.shopify.com/s/files/1/0432/5838/0450/files/xezikasadobaf.pdf
    • https://cdn.shopify.com/s/files/1/0434/8156/3286/files/pawogeloz.pdf
    • https://cdn.shopify.com/s/files/1/0439/4647/5678/files/uniquely_you_dress_form.pdf
    • https://cdn.shopify.com/s/files/1/0432/2073/0020/files/9605649535.pdf
    • https://cdn.shopify.com/s/files/1/0433/0664/7717/files/kemuve.pdf
    • https://cdn.shopify.com/s/files/1/0431/6043/6896/files/254762699.pdf
    • https://cdn.shopify.com/s/files/1/0432/9888/1704/files/rafujexemobesaravedov.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006851.bin
01ebc2f0f88cfc1225b00c46e2ecc47e6153fcdd53facbaeead94267a68e7cb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6851 4868 bytes
font_01_sfnt_off000078d1.bin
afb0deaebe1ab663d40deeca7a0a96c525efdf52eb06f54ef00bdf9610cab909		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78D1 10208 bytes

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