Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b57477ece571348…

MALICIOUS

PDF

54.6 KB Created: 2020-08-18 14:39:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: daca39313aa1d5ecf7f058f77bebb651 SHA-1: 0786a5866a3a830dbe6afca91d6de33b75565d04 SHA-256: 2b57477ece571348e05aa8625be75774b03d348d0ffab08983fe17987a42d28c
152 Risk Score

Malware Insights

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

The PDF file was flagged by a critical heuristic for linking to known malicious redirector infrastructure and for containing a mass external PDF link farm. The ML classifier also strongly indicated maliciousness. The embedded links, including one to 'ttraff.cc', suggest a redirection scheme to deliver malicious content or phishing pages. The document body, though partially corrupted, contains text related to 'identity property worksheet pdf', likely a lure.

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=identity+property+worksheet+pdf
    • http://files.michellevaske.com/uploads/1/3/1/3/131384468/e0a6ec.pdf
    • http://files.scrap-eechickdesigns.com/uploads/1/3/0/7/130739719/5708155.pdf
    • http://pexukit.dandeanfinancial.com/uploads/1/3/0/7/130775413/valikipibobifif_tozagedavasag_jofipefuwexuzor_kalarebilovunip.pdf
    • https://cdn.shopify.com/s/files/1/0434/4355/2416/files/12797025672.pdf
    • https://cdn.shopify.com/s/files/1/0433/6330/3575/files/morphology_and_ultrastructure_of_bacteria.pdf
    • https://cdn.shopify.com/s/files/1/0432/4727/2098/files/cnet_free_s_for_windows_10.pdf
    • https://cdn.shopify.com/s/files/1/0433/0576/2974/files/11290959289.pdf
    • https://cdn.shopify.com/s/files/1/0434/6619/5106/files/779066222.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/669297692.pdf
    • https://cdn.shopify.com/s/files/1/0440/0742/4158/files/magejixifoxexaxugagaju.pdf
    • https://cdn.shopify.com/s/files/1/0428/3249/4751/files/1212549670.pdf
    • https://cdn.shopify.com/s/files/1/0435/3461/4688/files/metal_guitar_vst.pdf
    • https://cdn.shopify.com/s/files/1/0429/2778/4095/files/gikadebebajigija.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_off00009728.bin
e611b9f5e08b854fe8ad9a75f138ab3d8f64dfbc8fa57d5aee061a1495da18cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x9728 5080 bytes
font_01_sfnt_off0000a887.bin
a412281ef958ee86d7c2b303a973f3506ad876da851056a189e083c2e7eca46a
pdf-font-stream PDF embedded font (sfnt) at offset 0xA887 10760 bytes