Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a8ea7a726b9bc7…

MALICIOUS

PDF

116.2 KB Created: 2020-09-03 17:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 304d9ddc0fa8296a482312fccc4efed2 SHA-1: 6c7695b55fb3565b5d556339fbd372db4ddc2fca SHA-256: f5a8ea7a726b9bc70b9b46b49a77b6aef3109dc63bbaa16b9c48eb3f446d73aa
152 Risk Score

Malware Insights

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

The PDF was flagged for containing a malicious redirector link and a large number of external PDF links, suggesting a link farm. The primary malicious URL identified is ttraff.ru. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the PDF structure and embedded links point towards a delivery mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/pify?keyword=uttarakhand+map++pdf
    • https://cdn.shopify.com/s/files/1/0427/6623/7852/files/wausau_tv_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/2894/5819/files/sony_acid_pro_7_key_generator_download.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/samsung_s5_bootloader_status_check_apk.pdf
    • https://cdn.shopify.com/s/files/1/0434/2903/6199/files/back_talk_stories.pdf
    • https://cdn.shopify.com/s/files/1/0429/2080/4518/files/confession_of_a_teenage_drama_queen_soundtrack.pdf
    • https://static.usrfiles.com/ugd/c83fdb_3e539d0e090b4980a61f019f7a2842f1.pdf
    • https://cdn.shopify.com/s/files/1/0436/9930/6650/files/deficiencia_de_vitamina_d_2020.pdf
    • https://cdn.shopify.com/s/files/1/0427/9877/6487/files/21121064408.pdf
    • https://cdn.shopify.com/s/files/1/0434/2412/0988/files/14490551678.pdf
    • https://cdn.shopify.com/s/files/1/0432/6129/6790/files/jirokijebazififabi.pdf
    • https://cdn.shopify.com/s/files/1/0428/5644/8167/files/51600918809.pdf
    • https://cdn.shopify.com/s/files/1/0428/4484/8295/files/26029432605.pdf
    • https://cdn.shopify.com/s/files/1/0431/8180/1629/files/88204243088.pdf
    • https://cdn.shopify.com/s/files/1/0432/4586/3067/files/bible_quiz_malayalam.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000138d0.bin
2eac26809e3065e1425932d82b9c5b08dd80a0c1d065853374123572d0136b99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x138D0 5128 bytes
font_01_sfnt_off00014a1a.bin
d5ecec3e822993868ba70e247019bcdb656a9fee58d620eb93bc70658e929280		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1A 3720 bytes
font_02_sfnt_off0001557d.bin
26ad3233cce96a8c23d983038a9984c00055ab06bf538c4267a9b650cf818fa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1557D 16764 bytes
font_03_sfnt_off000189ae.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x189AE 16164 bytes
font_04_sfnt_off00019f04.bin
038ba1a4588f0016d92cb32bc2219031b7341517234033bf2b6d7444f50f78fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19F04 10452 bytes

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