Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea557f8c13ec0b71…

MALICIOUS

PDF

45.8 KB Created: 2020-08-07 23:46:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 259719ed93de2a632008a10f7b3f3735 SHA-1: 4c7e9cf6176dccb8a90109df847d11df35abcd9a SHA-256: ea557f8c13ec0b712ec3da92d33f98af6c3e608686001165c75589be3e455096
154 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 Shopify. One of these links, https://ttraff.ru/pify?keyword=business+english+dialogue+pdf, is identified as a malicious redirector. This suggests the document is designed to lure users into clicking malicious links, likely for phishing or malware distribution.

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.ru/pify?keyword=business+english+dialogue+pdf
    • http://files.dogsanddetours.com/uploads/1/3/1/4/131407152/fawevupise.pdf
    • http://files.littletonpreschool.com/uploads/1/3/0/7/130739826/boxafabenupe-vageziril-vofafunufob.pdf
    • http://files.ukirkaustin.org/uploads/1/3/2/6/132682233/xetujebu-paxegexogopat-pilebolasi-tixaxikumamiju.pdf
    • http://files.whartontrust.org/uploads/1/3/0/7/130775897/4194922.pdf
    • https://cdn.shopify.com/s/files/1/0437/2643/8550/files/jefafifozekesifug.pdf
    • https://cdn.shopify.com/s/files/1/0428/2354/9094/files/tigurufabalifejer.pdf
    • https://cdn.shopify.com/s/files/1/0430/8546/3713/files/64458478029.pdf
    • https://cdn.shopify.com/s/files/1/0428/1312/8871/files/zabixegi.pdf
    • https://cdn.shopify.com/s/files/1/0439/1947/4856/files/85689770192.pdf
    • https://cdn.shopify.com/s/files/1/0430/4368/4503/files/fazijadazeki.pdf
    • https://cdn.shopify.com/s/files/1/0435/0876/0742/files/63300778598.pdf
    • https://cdn.shopify.com/s/files/1/0435/0004/4440/files/67150926161.pdf
    • https://cdn.shopify.com/s/files/1/0428/7329/0908/files/vujopenisi.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4049/files/kagomanitewatiwi.pdf
    • https://cdn.shopify.com/s/files/1/0431/4185/7448/files/ledikafe.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_off0000678a.bin
93084378bb1434385e866cdf8a7e0304686618d8b030fa9fa20b252a699dd186
pdf-font-stream PDF embedded font (sfnt) at offset 0x678A 5060 bytes
font_01_sfnt_off000078b0.bin
e6b2b40a1146d3db2f5dbf6065e3bf6b75b70d3fd839c0bf037df12b76c99917
pdf-font-stream PDF embedded font (sfnt) at offset 0x78B0 10408 bytes
font_02_sfnt_off00009c30.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C30 4324 bytes