Malicious PDF — malware analysis report

Static analysis result for SHA-256 5504af83e1f121f1…

MALICIOUS

PDF

47.6 KB Created: 2020-08-29 09:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb84ba988e5ebc9ce1885388275bd2bb SHA-1: 20dd7d77e8b447845bc283fc5f64170a4a30f8ed SHA-256: 5504af83e1f121f17d99204178a628c66066ac1ba75d2a4e89d57528fbe40d30
154 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to benign Shopify URLs, but one critical link to 'ttraff.club' is flagged as a malicious redirector. The document body, though heavily corrupted, contains the text 'Apsac handbook on child maltreatment' and the malicious URL, suggesting a lure to disguise the malicious intent. The ML classifier strongly indicated maliciousness, and the presence of a malicious redirector URL confirms the intent to lead the user to a harmful destination.

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.club/wix?keyword=apsac+handbook+on+child+maltreatment
    • https://cdn.shopify.com/s/files/1/0434/0645/9032/files/publication_463.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/45035229099.pdf
    • https://cdn.shopify.com/s/files/1/0431/4670/7104/files/wosiwukevebaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/6601/6412/files/manualidades_para_navidad_2018_con_papel.pdf
    • https://cdn.shopify.com/s/files/1/0432/0981/8274/files/dezexetawovifarogura.pdf
    • https://static.usrfiles.com/ugd/b8c837_283fb3897a294bedabd8e8dd2706be84.pdf
    • https://static.usrfiles.com/ugd/b8c837_935a8343ec544018a841e5ed105e3f9f.pdf
    • https://static.usrfiles.com/ugd/b8c837_45f32cf3ec2948f5b6d9871cdedec016.pdf
    • https://static.usrfiles.com/ugd/b8c837_dcec95e570a54392941df6eb90482fd5.pdf
    • https://static.usrfiles.com/ugd/b8c837_9a533beecad245c59d93b09b0b65424e.pdf
    • https://static.usrfiles.com/ugd/b8c837_4ffa065eb454449c953c3870047c2576.pdf
    • https://static.usrfiles.com/ugd/b8c837_ce8485c771254e16b8da408b3e5501c1.pdf
    • https://static.usrfiles.com/ugd/b8c837_06c2953bfe0242299008cf429c93311e.pdf
    • https://cdn.shopify.com/s/files/1/0431/0191/3244/files/bigipijurepa.pdf
    • https://cdn.shopify.com/s/files/1/0431/1128/4885/files/kikageratimave.pdf
    • https://cdn.shopify.com/s/files/1/0431/3301/0081/files/roxavojuxuromebabala.pdf
    • https://cdn.shopify.com/s/files/1/0427/5604/7004/files/52705742991.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_off000071c9.bin
a91e1b29827a4854bf6fb69f7041a65c543b311e04cc7e4af09dfeec27a8672b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71C9 5504 bytes
font_01_sfnt_off00008435.bin
7c9d28abd28c1389cc1a777a0760f90add3843955df386bfd8787b7b88ce1491		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8435 2084 bytes
font_02_sfnt_off00008d43.bin
3c0bc883b9a461c56c8a8253385cdfbce899e7d23709613c272d815998a5bab5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D43 10296 bytes

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