Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ca69802a83782d2…

MALICIOUS

PDF

47.0 KB Created: 2020-08-29 05:10:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1f23f5097c5aae526ff814b80ad35196 SHA-1: 9dff4bd064e3ca232b1c98fed507e77c8978cafb SHA-256: 8ca69802a83782d2d9ece9c2c2006dbb757db7f25aec5ace129a35fee8bf75b2
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, with one identified as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be malformed or obfuscated, but the presence of the malicious redirector URL suggests an attempt to lure users to a harmful site. The numerous other PDF links likely contribute to a link farm for SEO poisoning or to distribute further malicious content.

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.com/wix?keyword=frankenstein+important+quotes
    • https://static.usrfiles.com/ugd/b8c837_ddf5f9b00c734c4c8da90ac4924426b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_6b38903ac0944aadbc3783f42a6e28be.pdf
    • https://static.usrfiles.com/ugd/b8c837_dd4d65ea4f9444d2a5a347f9902067be.pdf
    • https://static.usrfiles.com/ugd/b8c837_709bbebb40af484b85921a52210b3de5.pdf
    • https://cdn.shopify.com/s/files/1/0434/1851/7665/files/luwejiponowuzumados.pdf
    • https://cdn.shopify.com/s/files/1/0432/2567/7982/files/neroxefizugozinetag.pdf
    • https://cdn.shopify.com/s/files/1/0447/0459/6122/files/fetilubareliba.pdf
    • https://cdn.shopify.com/s/files/1/0438/9987/9576/files/wing_chun_techniques_manual.pdf
    • https://static.usrfiles.com/ugd/b8c837_2f045f1f5c8348eeb9a5d24a90b7582d.pdf
    • https://static.usrfiles.com/ugd/b8c837_3ca6f42af8504f15a09752679f7346c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_9d6ac805ccef4705aeed88c6bf67e36f.pdf
    • https://static.usrfiles.com/ugd/b8c837_8f57224e68724d1e9728378571be4fcc.pdf
    • https://static.usrfiles.com/ugd/b8c837_b6983e9bcd0c43b4a205b45579147349.pdf
    • https://static.usrfiles.com/ugd/b8c837_e5adc04bb8e148e19018b756e5eab315.pdf
    • https://static.usrfiles.com/ugd/b8c837_03e7ce6df96048598ab3c47108988558.pdf
    • https://static.usrfiles.com/ugd/b8c837_b5500c3a573840c99ba3d36fb1ea6961.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_off00007830.bin
b6e5b8b453b29a44d0e218ed949ed29650325013ebd04710714f65cf66cef43b
pdf-font-stream PDF embedded font (sfnt) at offset 0x7830 5076 bytes
font_01_sfnt_off00008962.bin
3632b43f93caba63d97ef8c016a8ed285ba126f6dbff87e8adb61d5c8cfcff65
pdf-font-stream PDF embedded font (sfnt) at offset 0x8962 11464 bytes