Malicious PDF — malware analysis report

Static analysis result for SHA-256 35c731846ecb96c8…

MALICIOUS

PDF

51.0 KB Created: 2020-08-15 22:37:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bd18450b0b84922525fa25e53fdc231 SHA-1: 04bcf03165aa5b1c2885193050d665d4d7785379 SHA-256: 35c731846ecb96c884b10d8e07c031e34ab26dba7caf8be28908a76e32f8b8e2
152 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, many pointing to what appears to be a link farm hosted on Shopify. One prominent link, 'https://ttraff.ru/pify?keyword=at+last+sheet+music+easy+piano', is flagged as a malicious redirector. The document body, though heavily obfuscated, contains this URL and other PDF links, suggesting a social engineering lure to drive traffic to malicious infrastructure. The ML classifier strongly supports the malicious nature of this PDF.

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/pify?keyword=at+last+sheet+music+easy+piano
    • http://files.rmtauthor.com/uploads/1/3/1/4/131482975/gixubakovozo.pdf
    • http://topunero.bouwjesite.nl/uploads/1/3/2/8/132814930/c3f6caebff232.pdf
    • http://files.thetravelinrat.org/uploads/1/3/0/7/130776791/mavakinakivo.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/kesutevijabanarakagowewo.pdf
    • https://cdn.shopify.com/s/files/1/0435/9005/8152/files/biology_practical_book_class_12_cbse.pdf
    • https://cdn.shopify.com/s/files/1/0438/0409/8722/files/reglas_del_basquetbol_2020.pdf
    • https://cdn.shopify.com/s/files/1/0433/0805/6740/files/gokipurobos.pdf
    • https://cdn.shopify.com/s/files/1/0428/6346/0508/files/favazi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6397/5835/files/pikikuzis.pdf
    • https://cdn.shopify.com/s/files/1/0438/7730/2427/files/miwosirezizapex.pdf
    • https://cdn.shopify.com/s/files/1/0437/6448/2202/files/habitos_alimenticios_en_nios_de_primaria_en_mexico.pdf
    • https://cdn.shopify.com/s/files/1/0437/7359/1703/files/53847239634.pdf
    • https://cdn.shopify.com/s/files/1/0431/8858/4605/files/phn_mm_chuyn_file_nh_sang_min_ph.pdf
    • https://cdn.shopify.com/s/files/1/0433/0956/4068/files/40472444378.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_off0000755b.bin
d210fd26ca6b6fcb7f2da84ba42bfc57f5b85222f92fbb9cd6b84755ddd62b14		 pdf-font-stream PDF embedded font (sfnt) at offset 0x755B 5168 bytes
font_01_sfnt_off000086d4.bin
d8163a14b05eaad98de86914c108b87e4ef4e20ce6e037ef757c685614888b2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86D4 10320 bytes
font_02_sfnt_off0000aa2a.bin
b59afbb2f683942213df284fd86cd9422ada0c5f1ffac7698db8c94a40390bc4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAA2A 16100 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.