Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dbb59a8e89835e9…

MALICIOUS

PDF

40.8 KB Created: 2020-08-05 01:21:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4e09e2c05a76860bdbc08d8baea38f1 SHA-1: 03c02c5446703d2eb0cd8733595f5941e4f16e62 SHA-256: 9dbb59a8e89835e99c9f75964721b7bb5084be94687dfbd069d034982ec42e72
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.com, which is disguised as a free download for a psychology textbook. The document body and embedded links further reinforce this lure. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a malicious URL. No scripts were extracted from this sample.

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/pify?keyword=abnormal+psychology+an+integrative+approach+8th+edition+pdf+free
    • http://dazawoven.lymeaustralia.com/uploads/1/3/0/8/130814328/mivutesatubig_vurelobitopeso_nijezejidulet.pdf
    • http://files.skyladd.com/uploads/1/3/0/7/130775145/rozivifame.pdf
    • http://files.spiritwickcandleco.com/uploads/1/3/0/7/130775002/fewututebax.pdf
    • http://files.pccglobalmin.com/uploads/1/3/0/8/130874284/9315951.pdf
    • https://cdn.shopify.com/s/files/1/0434/3398/4157/files/totisosebabejo.pdf
    • https://cdn.shopify.com/s/files/1/0437/6277/8264/files/rebasasewezidanosu.pdf
    • https://cdn.shopify.com/s/files/1/0431/2032/8853/files/99298709982.pdf
    • https://cdn.shopify.com/s/files/1/0440/2233/3605/files/lodiwomixuzetilolunonuv.pdf
    • https://cdn.shopify.com/s/files/1/0430/8477/5577/files/vagisudom.pdf
    • https://cdn.shopify.com/s/files/1/0432/0886/8001/files/pekidudovez.pdf
    • https://cdn.shopify.com/s/files/1/0431/7095/5415/files/44714269020.pdf
    • https://cdn.shopify.com/s/files/1/0431/7764/0092/files/sutirepuzakiboxebenaz.pdf
    • https://cdn.shopify.com/s/files/1/0432/6889/8966/files/52460278891.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/73121007565.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_off0000595c.bin
cd1b3c837f84d92bcb636b98938dc3a2df7dfd88362f8ae74dc76047506cb0c2
pdf-font-stream PDF embedded font (sfnt) at offset 0x595C 6052 bytes
font_01_sfnt_off00006dcc.bin
39c90c584eee03e7ae635de6d7aa9f7454c05c3180df8ae3f76cd7eafea2af75
pdf-font-stream PDF embedded font (sfnt) at offset 0x6DCC 12492 bytes