Malicious PDF — malware analysis report

Static analysis result for SHA-256 957cc81b88aff4c4…

MALICIOUS

PDF

45.3 KB Created: 2020-08-30 15:09:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1aa33cf281531fac3807ed15217eeb9a SHA-1: 42ef49875bf2a6097e484a8e48a721677ad0a4dc SHA-256: 957cc81b88aff4c4807347e54baf0608de34530af5f8efb1936b725b6776f78d
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One critical heuristic firing indicates that a link within the PDF points to a known malicious redirector infrastructure at 'https://ttraff.cc/wix?keyword=java+concepts+early+objects+8th+edition+pdf'. This suggests the document is designed to lure users into clicking malicious links, likely for phishing or to download further malware. The ML classifier also strongly flagged this PDF as malicious.

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.cc/wix?keyword=java+concepts+early+objects+8th+edition+pdf
    • https://cdn.shopify.com/s/files/1/0431/5847/0822/files/lisowex.pdf
    • https://cdn.shopify.com/s/files/1/0437/6500/6494/files/cefr_b1_reading_test.pdf
    • https://cdn.shopify.com/s/files/1/0432/5851/1510/files/birth_rate_definition.pdf
    • https://cdn.shopify.com/s/files/1/0428/0346/2303/files/tasokijanilefujipuzi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9299/2410/files/wimoxu.pdf
    • https://static.usrfiles.com/ugd/eb5a6a_1f0f9fa5cdf4468a88ce6f12276f40f0.pdf
    • https://static.usrfiles.com/ugd/57c819_2d9cb38aaab04cbf8a84d1c44c61ea3c.pdf
    • https://cdn.shopify.com/s/files/1/0435/5850/2563/files/78774187674.pdf
    • https://cdn.shopify.com/s/files/1/0431/4834/5500/files/xovirivuforare.pdf
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/91969996891.pdf
    • https://cdn.shopify.com/s/files/1/0432/4805/8536/files/distribucion_normal_ejercicios_resueltos_paso_a_paso.pdf
    • https://static.usrfiles.com/ugd/4b874d_9049d321483a4b10ab735ad94029a8ba.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_e6dbf1cb88b94759b1baae69937e3e27.pdf
    • https://static.usrfiles.com/ugd/b8c837_8fbb4db14bcf4200b898f6145b9b1716.pdf
    • https://static.usrfiles.com/ugd/1cfe37_931b12204313496fac869a89bba10bfd.pdf
    • https://static.usrfiles.com/ugd/b8c837_a292157288c34cb6a8fde7ba316f5abb.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_off0000638e.bin
6392603348c79217a40d3720f7c33172f82257138e4421a749681e449d62a227		 pdf-font-stream PDF embedded font (sfnt) at offset 0x638E 5592 bytes
font_01_sfnt_off00007681.bin
8912af4bf3a13c0936fe90b308ff1a57185d5ef7b46f8143ddff89a17b5c866b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7681 10416 bytes
font_02_sfnt_off000099e2.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99E2 4324 bytes

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