Malicious PDF — malware analysis report

Static analysis result for SHA-256 757e5f5d13ffd0c9…

MALICIOUS

PDF

89.9 KB Created: 2020-07-27 00:48:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a23beda943df2a04dfe8c233a9d7c1b SHA-1: e9418013815ad15a8ad505491d914c4b5be99200 SHA-256: 757e5f5d13ffd0c9f5126ab85f6266a0ae96119e31c92a63d1e83cdb4349e64d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that point to known malicious redirector infrastructure, as well as a large number of links that appear to be part of an SEO link farm. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to direct the user to malicious content or phishing pages.

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/pify?keyword=akira+anime+movie++300mb
    • http://files.missmollysmemoriesphotography.com/uploads/1/3/1/3/131381772/234450.pdf
    • http://files.millhousefloristry.co.uk/uploads/1/3/2/7/132710753/nasinoja.pdf
    • http://files.deprofundisprods.com/uploads/1/3/0/7/130775275/dovisazamef_dubakamejom.pdf
    • http://files.buyschoolshirts.com/uploads/1/3/0/9/130969944/14821b6a074.pdf
    • http://files.ryanballonlineportfolio.com/uploads/1/3/0/8/130874060/392211.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/0691/0876/files/sujisamulife.pdf
    • https://cdn.shopify.com/s/files/1/0435/7298/6015/files/89350690918.pdf
    • https://cdn.shopify.com/s/files/1/0433/2178/6521/files/97671863388.pdf
    • https://cdn.shopify.com/s/files/1/0428/7230/7875/files/xutoxorulagesixisewusana.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/34007074416.pdf
    • https://cdn.shopify.com/s/files/1/0432/7079/9510/files/26409942319.pdf
    • https://cdn.shopify.com/s/files/1/0431/3484/5079/files/xixuzefakulejib.pdf
    • https://cdn.shopify.com/s/files/1/0432/5995/3312/files/46150839607.pdf
    • https://cdn.shopify.com/s/files/1/0433/6241/8846/files/fatizunarowume.pdf
    • https://cdn.shopify.com/s/files/1/0431/7587/0613/files/nexajimarusulumume.pdf
    • https://cdn.shopify.com/s/files/1/0433/7513/2824/files/4250129356.pdf
    • https://cdn.shopify.com/s/files/1/0428/3134/7868/files/45110755099.pdf
    • https://cdn.shopify.com/s/files/1/0430/0580/4698/files/zifon.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010428.bin
06de1d70f802117d2b8009a5e0f28690673422d982f615347e3f9d339e85e84e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10428 8956 bytes
font_01_sfnt_off00012241.bin
49dd5c09cf2275647b4759bf055b101b29d7e01ccedc60bbe1fff0a24da8c200		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12241 4888 bytes
font_02_sfnt_off000132b1.bin
2400c9ea12f97cb20b16a1f2c280561aaf6e8d10fb2a060de9d69148ceb57196		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132B1 11620 bytes

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