Malicious PDF — malware analysis report

Static analysis result for SHA-256 da7aa172d68f042d…

MALICIOUS

PDF

51.5 KB Created: 2020-08-26 15:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf1ad8ba0d4a39568de4d33513d9e6d2 SHA-1: 2432f7ce359924e39cdd0fb7948b649925b80b4c SHA-256: da7aa172d68f042ddb9bf9cf85c9ec268adc8254ac7e2346a16893a393cfe70c
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a malicious redirector link disguised with a lure related to 'cartoon animation films free'. This link, 'https://ttraff.link/pify?keyword=cartoon+animation+films+free', leads to known malicious infrastructure. The document also functions as a link farm, pointing to numerous other PDFs hosted on various domains, likely for SEO manipulation or to distribute further malicious content. 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.link/pify?keyword=cartoon+animation+films+free
    • http://xirim.w-here2stay.org/uploads/1/3/2/6/132682347/4794229.pdf
    • http://sadijet.longxarts.com/uploads/1/3/1/4/131454415/wejimidodevuj.pdf
    • http://files.spamitzvah.com/uploads/1/3/1/3/131384789/2268709.pdf
    • http://files.thebusinesscreditmovement.info/uploads/1/3/0/9/130969026/basoxadu-surekamu-kuborabejijuvow-fajasakan.pdf
    • http://files.executived-daytours.com/uploads/1/3/0/9/130968988/2051568.pdf
    • https://cdn.shopify.com/s/files/1/0428/5743/1196/files/46844516909.pdf
    • https://cdn.shopify.com/s/files/1/0437/9512/0289/files/sofagutumedajenumil.pdf
    • https://cdn.shopify.com/s/files/1/0431/9055/0679/files/los_hermanos_corsos_alexandre_dumas.pdf
    • https://cdn.shopify.com/s/files/1/0434/5259/6374/files/waxamilagozovimixulu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2250/8454/files/13560769441.pdf
    • https://cdn.shopify.com/s/files/1/0436/5913/3081/files/nofekewuzivonelopip.pdf
    • https://cdn.shopify.com/s/files/1/0434/2281/0268/files/34928381045.pdf
    • https://cdn.shopify.com/s/files/1/0430/2667/7913/files/kekiw.pdf
    • https://cdn.shopify.com/s/files/1/0432/2738/1920/files/18656942374.pdf
    • https://cdn.shopify.com/s/files/1/0437/0307/4984/files/deck_of_cards_java.pdf
    • https://cdn.shopify.com/s/files/1/0444/7987/3191/files/demographic_transition_model_stages_1_4.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_off00008e35.bin
1326fd89cc2369806995c3d5b063ae4ab14d3f3544d5816a7c4f795722726913		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E35 4816 bytes
font_01_sfnt_off00009e77.bin
964dc82c6af425e6bc8d7a7af612bd86dae81097b981dfa752238f5d5977efab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E77 10060 bytes

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