Malicious PDF — malware analysis report

Static analysis result for SHA-256 47e5b87e2abe2914…

MALICIOUS

PDF

53.5 KB Created: 2020-08-31 14:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5f34d312dd4125056c1b9c469b5c51a SHA-1: 1dde3caedba7b9ebecc91373394f2f63a9ddd1a4 SHA-256: 47e5b87e2abe291417f6053a519da97bb84199f64906e2d0f625f447f48b15bf
152 Risk Score

Malware Insights

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

The PDF contains a prominent link disguised as an authorization form for medical records, which is a common social engineering lure. The link directs to a malicious redirector hosted on 'ttraff.ru'. The ML classifier strongly flagged this PDF as malicious, and heuristic rules identified it as a malicious redirector and a link farm. No scripts were extracted, but the primary attack vector is the embedded malicious URL.

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.ru/wix?keyword=authorization+form+to+release+medical+records
    • https://static.usrfiles.com/ugd/4bdc6d_20d044954c554efca2b0aa7e2f238703.pdf
    • https://static.usrfiles.com/ugd/b8c837_99fad0fd65e749edbd69c1ff0b3a1c86.pdf
    • https://static.usrfiles.com/ugd/cac9e4_2226b8dc04ee4dbbb3c1db6684a97294.pdf
    • https://static.usrfiles.com/ugd/83d902_d7f5d84fb7ec42b9a7932684dd40a1fd.pdf
    • https://static.usrfiles.com/ugd/cec570_a2d27c3235a5495ca6ff89d7f1b32e6c.pdf
    • https://cdn.shopify.com/s/files/1/0463/1196/4829/files/23045604656.pdf
    • https://cdn.shopify.com/s/files/1/0449/4249/1816/files/goldsmith_guide_ffxiv.pdf
    • https://cdn.shopify.com/s/files/1/0431/4267/6636/files/16234798391.pdf
    • https://cdn.shopify.com/s/files/1/0435/3140/3423/files/acetic_acid_production_process.pdf
    • https://cdn.shopify.com/s/files/1/0434/4443/7144/files/50169738364.pdf
    • https://static.usrfiles.com/ugd/b8c837_8295da48881c428cb93d8b78ba380479.pdf
    • https://static.usrfiles.com/ugd/a59130_d74ab501e4b541a1a72603b1dab9801a.pdf
    • https://static.usrfiles.com/ugd/b8c837_c4a465b6bae845dab4d15d374d697843.pdf
    • https://static.usrfiles.com/ugd/dc8a8e_1f921d74728f4e7c9fcc9415acabf620.pdf
    • https://cdn.shopify.com/s/files/1/0430/9581/8397/files/talk_video_kaise_karenge.pdf
    • https://cdn.shopify.com/s/files/1/0429/4849/3475/files/toyota_rav4_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/3028/1381/files/common_nouns_worksheet_year_1.pdf
    • https://cdn.shopify.com/s/files/1/0447/9988/5463/files/xml_to_csv.pdf
    • https://cdn.shopify.com/s/files/1/0432/5372/7387/files/dell_brocade_6505_datasheet.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_off000084d6.bin
01414bc228b0baef15a449b2bfe15d240ae344dd23e7790eee392ee073054653		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84D6 5180 bytes
font_01_sfnt_off0000964e.bin
98e2f9cf68457d7eff5cd85437b94f238d64c5d9128a9a9643cac3898f2895da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x964E 10584 bytes
font_02_sfnt_off0000ba08.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA08 4324 bytes

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