Malicious PDF — malware analysis report

Static analysis result for SHA-256 da0b6ce6a2ffd49a…

MALICIOUS

PDF

33.2 KB Created: 2020-09-03 15:47:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8c6213207adfb8f858ac794a651fa21 SHA-1: d9fbe8e1cd95e263cae470b7ec8124195a5133ce SHA-256: da0b6ce6a2ffd49a53d9b24b204d8ea931a3288b0f22079e48da9f7ffcb6cf91
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to Shopify domains, likely as part of a link farm for SEO manipulation. Crucially, one embedded URL, 'https://ttraff.me/wix?keyword=aarum+kaanathe+song+lyrics', is identified as a known malicious redirector. The document body, though partially corrupted, contains this URL and the song lyric title, suggesting a lure to direct users to malicious infrastructure. The ML classifier 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.me/wix?keyword=aarum+kaanathe+song+lyrics
    • https://cdn.shopify.com/s/files/1/0461/3757/3529/files/free_brother_machine_embroidery_designs.pdf
    • https://cdn.shopify.com/s/files/1/0429/5645/6095/files/97733613450.pdf
    • https://cdn.shopify.com/s/files/1/0433/5802/7928/files/detexeba.pdf
    • https://cdn.shopify.com/s/files/1/0427/7560/9510/files/18082888829.pdf
    • https://static.usrfiles.com/ugd/b16523_8a3764fb18e3462f95fa341a51bfceea.pdf
    • https://static.usrfiles.com/ugd/74e9cf_1ac8662f48eb48d78fa3c8881aa1a800.pdf
    • https://static.usrfiles.com/ugd/63d3ad_3aa6eb78891b424996d1fd8deb815df5.pdf
    • https://static.usrfiles.com/ugd/10e3af_e974d782e1294130825d49a2cd10b941.pdf
    • https://static.usrfiles.com/ugd/5a1791_ca728f3b976c4df2ba3bd2cb9288e7e0.pdf
    • https://cdn.shopify.com/s/files/1/0431/2494/9153/files/63002649796.pdf
    • https://cdn.shopify.com/s/files/1/0450/9263/4789/files/begin_the_beguine_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0430/9444/2133/files/2731674915.pdf
    • https://cdn.shopify.com/s/files/1/0432/3803/1518/files/brivo_access_control.pdf
    • https://cdn.shopify.com/s/files/1/0428/1391/5303/files/wodesafisozaxubosed.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_off0000459a.bin
2b71d694324059b3ad990495778efbd59f408e492881b24dfe6f7fbe9c9e0a3a
pdf-font-stream PDF embedded font (sfnt) at offset 0x459A 5368 bytes
font_01_sfnt_off000057c0.bin
5d9d6bd0a1ccb280250504af2fc29c512cf2bfc55c4c6f2f006434eb521187c3
pdf-font-stream PDF embedded font (sfnt) at offset 0x57C0 9492 bytes