Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a1f5ef860a7492…

MALICIOUS

PDF

54.2 KB Created: 2020-08-30 07:40:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d795d76a1651976d171f374a4affb4ad SHA-1: 6d7c42cb80c6fef2573ab921763818ad090943e8 SHA-256: b6a1f5ef860a749232998d29ee37624da02a509de8d5c41d0546609d26da5959
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 pointing to what appears to be a link farm designed for SEO manipulation. One of these links, https://ttraff.cc/wix?keyword=meses+hebreos+y+equivalentes+pdf, is flagged as a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily corrupted, contains the title 'Meses hebreos y equivalentes pdf' and the malicious URL, suggesting a lure to a malicious site.

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=meses+hebreos+y+equivalentes+pdf
    • https://static.usrfiles.com/ugd/b8c837_a2e58e398be845f0a68eaf279256ff45.pdf
    • https://static.usrfiles.com/ugd/0511f5_152a36e6efe74acc85bdb1239aa0d826.pdf
    • https://static.usrfiles.com/ugd/fe83c3_ed11dab2a3ef4da7b29b3d5df37f8034.pdf
    • https://static.usrfiles.com/ugd/0a593f_65e1c46fa5fa4464b7a1b002f4a42715.pdf
    • https://static.usrfiles.com/ugd/b8c837_16e25ccc27be480499701f392cade4ff.pdf
    • https://cdn.shopify.com/s/files/1/0438/9571/8040/files/54270376225.pdf
    • https://cdn.shopify.com/s/files/1/0428/5415/4406/files/moxedodojefuzokigaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/2901/2381/files/43163292695.pdf
    • https://cdn.shopify.com/s/files/1/0434/8562/6520/files/29716736512.pdf
    • https://cdn.shopify.com/s/files/1/0431/0014/3777/files/apache_hive_cookbook_download.pdf
    • https://cdn.shopify.com/s/files/1/0432/7371/5870/files/bosch_800_series_dishwasher_manual.pdf
    • https://cdn.shopify.com/s/files/1/0435/2396/5080/files/cch_ct_file_bng_nitro.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_off0000856e.bin
7f60d17440adcdba5ef04f24e5fa6880f0d3cc64fe2684aa936cf4938ff36950
pdf-font-stream PDF embedded font (sfnt) at offset 0x856E 5444 bytes
font_01_sfnt_off000097ec.bin
510570882799ea22bbccfe58b815e01a0f415132813e3c6c524cb6b97d7cf450
pdf-font-stream PDF embedded font (sfnt) at offset 0x97EC 11244 bytes
font_02_sfnt_off0000bc6b.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xBC6B 4324 bytes