Malicious PDF — malware analysis report

Static analysis result for SHA-256 42c0a357f7fe0bea…

MALICIOUS

PDF

40.1 KB Created: 2020-08-26 10:59:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 078c6c3824c4827a099ef202f2aeb9b4 SHA-1: e8eeac1bab1baba0dcf59cb33e1c5da55821c976 SHA-256: 42c0a357f7fe0bea26d2bae8e885079c3164bb90e5cd34fa68a00ddb0ce934eb
152 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a significant portion pointing to a link farm hosted on Shopify. These links are designed to lure users to malicious infrastructure, as indicated by the critical PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing on 'https://ttraff.ru/pify?keyword=kaval+sesi+mp3+indir'. The ML classifier also strongly flagged this PDF as malicious. The document body contains garbled text along with the primary malicious URL, suggesting an attempt to obscure the 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.ru/pify?keyword=kaval+sesi+mp3+indir
    • http://penogi.clarkstonphysio.com/uploads/1/3/2/6/132681352/wamamuxigazasibufoxo.pdf
    • http://kavuzi.camrapenn.org/uploads/1/3/1/0/131070450/xotivudufip_zeremat.pdf
    • http://files.localeyeonline.com/uploads/1/3/1/4/131406105/479db89720aa2.pdf
    • https://cdn.shopify.com/s/files/1/0433/0009/4112/files/vumorepikulijexekef.pdf
    • https://cdn.shopify.com/s/files/1/0439/7904/7070/files/kittydog_reference_sheet.pdf
    • https://cdn.shopify.com/s/files/1/0437/0409/0777/files/3174548071.pdf
    • https://cdn.shopify.com/s/files/1/0430/8526/7097/files/pafatodavulusefavelar.pdf
    • https://cdn.shopify.com/s/files/1/0437/3915/2535/files/bloc_party_helicopter.pdf
    • https://cdn.shopify.com/s/files/1/0434/4247/1064/files/mapa_fisico_mudo_oceania.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/kusoribexumobil.pdf
    • https://cdn.shopify.com/s/files/1/0436/2718/4281/files/africa_cup_of_nations_2020_schedule.pdf
    • https://cdn.shopify.com/s/files/1/0434/2526/7877/files/hashmap_vs_treemap.pdf
    • https://cdn.shopify.com/s/files/1/0430/4096/4759/files/alien_worker_song.pdf
    • https://cdn.shopify.com/s/files/1/0427/8000/0422/files/makalah_logam_alkali_tanah.pdf
    • https://cdn.shopify.com/s/files/1/0431/6676/1120/files/serixela.pdf
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/openssl_create_ca_cert.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_off00004c8f.bin
cb10b0e108bacf621251b89d59a900edcb98b545e5c4851ccb9b94cf004b5603		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4C8F 4896 bytes
font_01_sfnt_off00005d07.bin
6047f5fe856d965ba65ff73e501a9b01d3b14fba865bcea776c962cf946b07a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D07 12724 bytes
font_02_sfnt_off000083ff.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83FF 4324 bytes

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