Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc04f1f7386911dc…

MALICIOUS

PDF

38.5 KB Created: 2020-08-07 22:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e826d9bbcb01115004a060a0ceb05d55 SHA-1: f15430effe221dd707da6a2f7df58985793a3266 SHA-256: cc04f1f7386911dc0570a5fdf33ddcc503d28c0f19cccfe44f5223b93ee8c563
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm and a malicious redirector URL, suggesting a phishing or scam attempt disguised as academic material. The ML classifier strongly indicates maliciousness. The embedded URL points to a redirector that likely leads to further malicious content or exploits.

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=thomas+calculus+2+t%25C3%25BCrk%25C3%25A7e+pdf+%25C3%25A7%25C3%25B6z%25C3%25BCmleri
    • http://files.ranallofamilycleveland.com/uploads/1/3/1/6/131606861/sagurofabor.pdf
    • http://files.tianashoresassociation.com/uploads/1/3/1/4/131437147/a0519eb4ac89.pdf
    • http://files.ctlf-empowers.org/uploads/1/3/2/6/132681670/3f55a7d799db8c.pdf
    • http://files.balwynhighschool1957to1962reunion.org/uploads/1/3/1/0/131070529/kunegelaru-pajit-forijasugazepo-lirilodadisixew.pdf
    • http://files.purplespirithealing.com/uploads/1/3/1/1/131164350/lonukafugoxutupalil.pdf
    • https://cdn.shopify.com/s/files/1/0433/3695/8104/files/tixab.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nazowexoratusitufunu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5560/4121/files/mikurasugevog.pdf
    • https://cdn.shopify.com/s/files/1/0429/5963/4591/files/pidosonogonezuwuvizisatus.pdf
    • https://cdn.shopify.com/s/files/1/0429/6838/3641/files/76033791057.pdf
    • https://cdn.shopify.com/s/files/1/0431/4647/7725/files/binary_search_in_c.pdf
    • https://cdn.shopify.com/s/files/1/0431/8933/8276/files/61687376663.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/50537202024.pdf
    • https://cdn.shopify.com/s/files/1/0445/8492/7396/files/pdf_file_open_app_download_for_android.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_off00005397.bin
dc4720bdac1c6cc02e55a404fb7549d5a1365b64e319060412e145a969e43937
pdf-font-stream PDF embedded font (sfnt) at offset 0x5397 6032 bytes
font_01_sfnt_off00006737.bin
8aaab581b6a3cb47563a3f3cccbe0913c7aac14e92c7825265f565b48c55d162
pdf-font-stream PDF embedded font (sfnt) at offset 0x6737 11364 bytes